<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1679-4974</journal-id>
<journal-title><![CDATA[Epidemiologia e Serviços de Saúde]]></journal-title>
<abbrev-journal-title><![CDATA[Epidemiol. Serv. Saúde]]></abbrev-journal-title>
<issn>1679-4974</issn>
<publisher>
<publisher-name><![CDATA[Secretaria de Vigilância em Saúde e Ambiente - Ministério da Saúde do Brasil]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1679-49742007000400006</article-id>
<article-id pub-id-type="doi">10.5123/S1679-49742007000400006</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Aedes aegypti: inseticidas, mecanismos de ação e resistência]]></article-title>
<article-title xml:lang="en"><![CDATA[Aedes aegypti: insecticides: mechanisms of action and resistance]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Braga]]></surname>
<given-names><![CDATA[Ima Aparecida]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valle]]></surname>
<given-names><![CDATA[Denise]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Ministério da Saúde Secretaria de Vigilância em Saúde Diretoria Técnica de Gestão]]></institution>
<addr-line><![CDATA[Brasília DF]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Fundação Instituto Oswaldo Cruz Instituto Oswaldo Cruz Laboratório de Fisiologia e Controle de Artrópodes Vetores]]></institution>
<addr-line><![CDATA[Rio de Janeiro RJ]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<volume>16</volume>
<numero>4</numero>
<fpage>179</fpage>
<lpage>293</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iec.gov.br/scielo.php?script=sci_arttext&amp;pid=S1679-49742007000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iec.gov.br/scielo.php?script=sci_abstract&amp;pid=S1679-49742007000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iec.gov.br/scielo.php?script=sci_pdf&amp;pid=S1679-49742007000400006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[No Brasil, o Aedes aegypti é responsável pela transmissão de dengue e o Aedes albopictus, potencial vetor, está se disseminando no país. O uso de inseticidas químicos ainda é o principal componente de controle do vetor. A ação das principais classes dos compostos tradicionalmente usados em Saúde Pública é descrita, assim como os mecanismos de resistência selecionados pelas populações do vetor. Produtos alternativos, com potencial de utilização no controle do A. aegypti, incluindo o biolarvicida Bti e alguns reguladores do desenvolvimento de insetos, também são discutidos. Pretende-se contribuir com o uso racional de inseticidas, considerando os diferentes componentes do controle integrado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In Brazil, dengue is transmitted by Aedes aegypti. Aedes albopictus, a potential dengue vector, is spreading all over the country. The use of chemical insecticides is yet the main vector control component. The action of the main classes of compounds traditionally employed in Public Health is described, as well as the resistance mechanisms selected by vector populations. Alternative products, with potential to be used in the control of A. aegypti, including the biolarvicide Bti and some insect growth regulators, are also discussed. The authors aim at contributing with the rational insecticide use, taking into account the different components of the integrated control.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Aedes aegypti]]></kwd>
<kwd lng="pt"><![CDATA[Aedes albopictus]]></kwd>
<kwd lng="pt"><![CDATA[inseticida]]></kwd>
<kwd lng="pt"><![CDATA[resistência]]></kwd>
<kwd lng="en"><![CDATA[Aedes aegypti]]></kwd>
<kwd lng="en"><![CDATA[Aedes albopictus]]></kwd>
<kwd lng="en"><![CDATA[insecticide]]></kwd>
<kwd lng="en"><![CDATA[resistance]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana"><b><a name="topo"></a>ARTIGO DE    REVIS&Atilde;O</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="Verdana"><b><i>Aedes aegypti</i>: inseticidas, mecanismos    de a&ccedil;&atilde;o e resist&ecirc;ncia<a href="#nota"><sup>*</sup></a></b></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b><i>Aedes aegypti</i>: insecticides, mechanisms    of action and resistance</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Ima Aparecida Braga<sup>I</sup>; Denise Valle<sup>II</sup></b></font></p>     <p><font size="2" face="Verdana"><sup>I</sup>Programa Nacional de Controle da Dengue, Diretoria    T&eacute;cnica de Gest&atilde;o, Secretaria de Vigil&acirc;ncia em Sa&uacute;de,    Minist&eacute;rio da Sa&uacute;de, Bras&iacute;lia-DF, Brasil    <br><sup>II</sup>Laborat&oacute;rio    de Fisiologia e Controle de Artr&oacute;podes Vetores, Instituto Oswaldo Cruz,    Funda&ccedil;&atilde;o Instituto Oswaldo Cruz, Rio de Janeiro-RJ, Brasil</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="verdana"><a href="#endereco">Endere&ccedil;o para correspond&ecirc;ncia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>RESUMO</b></font></p>     <p><font size="2" face="Verdana">No Brasil, o <i>Aedes aegypti</i> &eacute; respons&aacute;vel    pela transmiss&atilde;o de dengue e o <i>Aedes albopictus</i>, potencial vetor,    est&aacute; se disseminando no pa&iacute;s. O uso de inseticidas qu&iacute;micos    ainda &eacute; o principal componente de controle do vetor. A a&ccedil;&atilde;o    das principais classes dos compostos tradicionalmente usados em Sa&uacute;de    P&uacute;blica &eacute; descrita, assim como os mecanismos de resist&ecirc;ncia    selecionados pelas popula&ccedil;&otilde;es do vetor. Produtos alternativos,    com potencial de utiliza&ccedil;&atilde;o no controle do <i>A. aegypti</i>,    incluindo o biolarvicida Bti e alguns reguladores do desenvolvimento de insetos,    tamb&eacute;m s&atilde;o discutidos. Pretende-se contribuir com o uso racional    de inseticidas, considerando os diferentes componentes do controle integrado.</font></p>     <p><font size="2" face="Verdana"><b>Palavras-chave:</b> <i>Aedes aegypti</i>;    <i>Aedes albopictus</i>; inseticida; resist&ecirc;ncia.</font></p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>SUMMARY</b></font></p>     <p><font size="2" face="Verdana">In Brazil, dengue is transmitted by <i>Aedes aegypti</i>. <i>Aedes albopictus</i>, a potential dengue vector, is    spreading all over the country. The use of chemical insecticides is yet the    main vector control component. The action of the main classes of compounds traditionally    employed in Public Health is described, as well as the resistance mechanisms    selected by vector populations. Alternative products, with potential to be used    in the control of <i>A. aegypti</i>, including the biolarvicide Bti and some    insect growth regulators, are also discussed. The authors aim at contributing    with the rational insecticide use, taking into account the different components    of the integrated control.</font></p>     <p><font size="2" face="Verdana"><b>Key words:</b> <i>Aedes aegypti</i>;    <i>Aedes albopictus</i>; insecticide; resistance.</font></p> <hr size="1" noshade>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Introdu&ccedil;&atilde;o</b></font></p>     <p><font size="2" face="Verdana"> A dengue &eacute; uma doen&ccedil;a transmitida    por mosquitos do g&ecirc;nero <i>Aedes</i>, sendo incriminadas v&aacute;rias    esp&eacute;cies do subg&ecirc;nero <i>Stegomyia</i> (<i>Aedes aegypti, Aedes    albopictus</i> e <i>Aedes polynesiensis</i>), nas quais o v&iacute;rus foi encontrado    <i>in natura</i>.<sup>1,2</sup> Experimentos em laborat&oacute;rio tamb&eacute;m    mostraram a susceptibilidade de outras esp&eacute;cies de <i>Aedes</i> ao v&iacute;rus    da dengue.<sup>2</sup> O mais importante vetor de dengue, entretanto, &eacute;    o <i>Aedes aegypti</i>. O <i>Aedes albopictus</i> &eacute; um    vetor de import&acirc;ncia secund&aacute;ria na &Aacute;sia;<sup>3</sup> contudo,    em algumas &aacute;reas da Indon&eacute;sia, t&ecirc;m ocorrido surtos com freq&uuml;&ecirc;ncia,    nas partes rurais do pa&iacute;s, onde o <i>Ae. albopictus</i> &eacute; a esp&eacute;cie    predominante.<sup>4</sup> Ademais, estudos sobre a transmiss&atilde;o de dengue    em vilas da Tail&acirc;ndia indicaram importante papel do <i>Ae. albopictus</i>    na transmiss&atilde;o dessa doen&ccedil;a.<sup>5,6</sup> Nas Am&eacute;ricas,    o <i>Ae. albopictus</i> ainda n&atilde;o foi incriminado de maneira consistente    como vetor de dengue, embora alguns estudos tenham encontrado mosquitos naturalmente    infectados.<sup>7,8</sup></font></p>     <p><font size="2" face="Verdana"> Tanto o <i>Ae. aegypti</i> quanto o <i>Ae. albopictus</i>    s&atilde;o importantes vetores de arbov&iacute;rus para o homem. Ambas s&atilde;o    esp&eacute;cies ex&oacute;ticas que chegaram ao continente americano ap&oacute;s    desenvolverem, em seus ambientes prim&aacute;rios, grau significante de sinantropia.    Geralmente, a ocorr&ecirc;ncia de epidemias de dengue est&aacute; diretamente    relacionada com a presen&ccedil;a e a densidade de seus vetores.<sup>2,9</sup></font></p>     <p><font size="2" face="Verdana"><i><b>Aedes aegypti</b></i></font></p>     <p><font size="2" face="Verdana"> O <i>Aedes aegypti</i> (Diptera: Culicidae) &eacute;    um mosquito origin&aacute;rio da &Aacute;frica, onde existem popula&ccedil;&otilde;es selvagens   e dom&eacute;sticas. Originalmente descrito no Egito, o   que lhe conferiu seu nome espec&iacute;fico (<i>Aedes aegypti</i>),   ele tem acompanhado o homem em sua permanente   migra&ccedil;&atilde;o.<sup>10,11</sup></font></p>     <p><font size="2" face="Verdana">A esp&eacute;cie <i>Ae. aegypti</i> tem    distribui&ccedil;&atilde;o mundial. Encontra-se, em geral, entre as latitudes    35<sup>o</sup> Norte e 35<sup>o</sup> Sul, que correspondem &agrave; isoterma de inverno    de 10<sup>o</sup>C. A distribui&ccedil;&atilde;o desse mosquito tamb&eacute;m &eacute;    restrita &agrave; altitude. Embora a esp&eacute;cie n&atilde;o seja normalmente    encontrada em zonas acima de 1.000 metros de altitude, sua presen&ccedil;a j&aacute;    foi detectada a alturas de mais de 2.000 metros, na &Iacute;ndia e na Col&ocirc;mbia.<sup>12</sup>    &Eacute; um mosquito adaptado ao ambiente urbano e utiliza os recipientes mais    freq&uuml;entes no domic&iacute;lio ou peridomic&iacute;lio &#8211; tanques    de armazenamento de &aacute;gua e vasilhames tempor&aacute;rios, dentro e fora    das casas, como potes, barris, pneum&aacute;ticos usados, latas, garrafas e    vasos de plantas &#8211; para o desenvolvimento de sua fase larv&aacute;ria.<sup>10,11</sup>    As larvas tamb&eacute;m podem ser encontradas em calhas de telhado, axilas de    folhas, bambus cortados. Essa esp&eacute;cie &eacute; antropof&iacute;lica e    tem h&aacute;bitos diurnos, alimentando-se e depositando seus ovos, preferencialmente,    ao amanhecer e no per&iacute;odo vespertino pr&oacute;ximo ao crep&uacute;sculo.<sup>10</sup></font></p>     <p><font size="2" face="Verdana">O <i>Ae. aegypti</i> foi reconhecido como transmissor    da febre amarela em 1881, por Carlos J. Finlay.<sup>13,14</sup> Em 1906, Brancroft    publicou as primeiras evid&ecirc;ncias de que o mosquito tamb&eacute;m era o    vetor de dengue, fato posteriormente confirmado por Agramonte, em 1906, e por    Simmons, em 1931.<sup>15,17</sup></font></p>     <p><font size="2" face="Verdana"> Provavelmente, esse vetor foi introduzido nas    Am&eacute;ricas a bordo de barcos vindos da Europa, que cruzavam   o Atl&acirc;ntico durante as primeiras explora&ccedil;&otilde;es e   coloniza&ccedil;&otilde;es europ&eacute;ias ao Novo Mundo.<sup>14</sup> Os primeiros   registros de sua identifica&ccedil;&atilde;o em terras do Brasil foram   em 1898, por Lutz, e em 1899, por Ribas.<sup>18</sup></font></p>     <p><font size="2" face="Verdana">Atualmente, o vetor &eacute; encontrado em uma    larga faixa do continente americano, que se estende do Uruguai at&eacute; o    sul dos Estados Unidos da Am&eacute;rica (EUA), com a ocorr&ecirc;ncia de surtos    importantes de dengue em v&aacute;rios pa&iacute;ses, como Venezuela, Cuba,    Brasil e, recentemente, Paraguai.<sup>19</sup> No Brasil, o <i>Ae. aegypti</i>    est&aacute; presente nos 26 Estados e no Distrito Federal.<sup>20</sup> A distribui&ccedil;&atilde;o    do mosquito no pa&iacute;s em 2006 pode ser observada na <a href="#fig1">Figura    1</a>.</font></p>     ]]></body>
<body><![CDATA[<p><a name="fig1"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/ess/v16n4/4a06f1.gif"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"> <i>Aedes aegypti</i> continua sendo o &uacute;nico    vetor incriminado na transmiss&atilde;o de dengue no Brasil e   estudos recentes confirmam sua capacidade de se   infectar com os v&iacute;rus da dengue e da febre amarela.   Este trabalho tamb&eacute;m verificou que os mosquitos   coletados em &aacute;reas end&ecirc;micas e de transi&ccedil;&atilde;o da   febre amarela silvestre tinham alta susceptibilidade   ao v&iacute;rus amar&iacute;lico.<sup>21</sup></font></p>     <p><font size="2" face="Verdana"><i><b>Aedes</b></i> <b><i>albopictus</i></b></font></p>     <p><font size="2" face="Verdana"> Embora o <i>Ae. albopictus</i> tamb&eacute;m    seja encontrado em vasilhames tempor&aacute;rios, essa esp&eacute;cie prefere    o <i>habitat</i> natural da floresta, como buracos em &aacute;rvores, axilas    de folhas, intern&oacute;dios de bambus e cascas de coco. Cria-se, mais freq&uuml;entemente,    fora das casas, em jardins; e com menor freq&uuml;&ecirc;ncia dentro delas,    em vasilhames artificiais.</font></p>     <p><font size="2" face="Verdana">Recentemente, a esp&eacute;cie invadiu o oeste    da &Aacute;frica e as Am&eacute;ricas do Sul e do Norte, onde pode vir a se   tornar importante na transmiss&atilde;o de dengue e outras   doen&ccedil;as virais. Provavelmente, o intenso com&eacute;rcio   de pneum&aacute;ticos usados tem sido o respons&aacute;vel pela   dispers&atilde;o desse mosquito para novas &aacute;reas, nas &uacute;ltimas   duas d&eacute;cadas.<sup>22</sup></font></p>     <p><font size="2" face="Verdana">O primeiro registro do <i>Ae. albopictus</i>    no Brasil data de 1986, no Estado do Rio de Janeiro.<sup>23</sup> Estudos realizados    naquele mesmo ano, pela extinta Superintend&ecirc;ncia de Campanhas de Sa&uacute;de    P&uacute;blica do Minist&eacute;rio da Sa&uacute;de (Sucam), verificaram a presen&ccedil;a    da esp&eacute;cie nos Estados de Minas Gerais e de S&atilde;o Paulo; e no ano    seguinte, no Estado do Esp&iacute;rito Santo. Assim, em apenas um ano, o <i>Ae.    albopictus</i> j&aacute; se encontrava instalado em todos os Estados da Regi&atilde;o    Sudeste.<sup>24</sup></font></p>     <p><font size="2" face="Verdana">Desde sua introdu&ccedil;&atilde;o no pa&iacute;s,    &eacute; crescente e acelerada a expans&atilde;o do <i>Ae. albopictus</i> e    apenas sete Estados ainda n&atilde;o relataram infesta&ccedil;&atilde;o por    essa esp&eacute;cie: Amap&aacute;, Roraima, Acre e Tocantins (Regi&atilde;o    Norte); e Piau&iacute;, Cear&aacute; e Sergipe (Regi&atilde;o Nordeste). At&eacute;    o ano de 2002, os Estados do Par&aacute; e de Alagoas haviam registrado sua    ocorr&ecirc;ncia em apenas um Munic&iacute;pio &#8211; Medicil&acirc;ndia e    Macei&oacute;, respectivamente.<sup>25</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> O <i>Aedes albopictus</i> &eacute; um vetor potencial    de dengue epid&ecirc;mica. Ainda &eacute; obscuro o efeito que a presen&ccedil;a   dessa esp&eacute;cie pode provocar na din&acirc;mica de transmiss&atilde;o   da doen&ccedil;a nas Am&eacute;ricas. Acredita-se que   tamb&eacute;m possa afetar o potencial de transmiss&atilde;o da   febre amarela no Brasil, atravessando o nicho ecol&oacute;gico   entre a selva e os ciclos de transmiss&atilde;o urbanos.   Atualmente, em raz&atilde;o de seu potencial como vetor, os   Centers for Diseases Control and Prevention (CDC) dos   EUA mant&ecirc;m um banco de dados da distribui&ccedil;&atilde;o do   Ae. <i>albopictus</i> naquele pa&iacute;s, com &ecirc;nfase particular no   monitoramento de sua expans&atilde;o para &aacute;reas nas quais   o v&iacute;rus La Crosse e o v&iacute;rus da encefalite eq&uuml;ina oriental   s&atilde;o enzo&oacute;ticos.<sup>26</sup></font></p>     <p><font size="2" face="Verdana">Em 1995, esse vetor foi encontrado pela primeira   vez na Am&eacute;rica, naturalmente infectado com o v&iacute;rus   da dengue, durante um surto da doen&ccedil;a ocorrido no   M&eacute;xico. Os v&iacute;rus DEN-1 e DEN-3 foram detectados em   machos adultos, indicando transmiss&atilde;o transovariana   de dengue naquela regi&atilde;o do continente.<sup>8</sup> Embora   n&atilde;o se tenha registro de transmiss&atilde;o de dengue no   Brasil por Ae. <i>albopictus</i>, n&atilde;o se pode deixar de estar   vigilante quanto a sua potencial import&acirc;ncia como   vetor, visto que ele tem se disseminado nos ambientes   rural, semi-rural e, inclusive, urbano. Em testes de   laborat&oacute;rio, a primeira popula&ccedil;&atilde;o de Ae. <i>albopictus</i>   detectada no Brasil demonstrou capacidade de   transmitir dengue, febre amarela e v&iacute;rus de encefalite   eq&uuml;ina venezuelana.<sup>27</sup></font></p>     <p><font size="2" face="Verdana"> An&aacute;lise comparativa da susceptibilidade,    em condi&ccedil;&otilde;es experimentais, aos v&iacute;rus DEN-2 e da febre    amarela, de mosquitos coletados em v&aacute;rias localidades do Brasil e dos    EUA, detectou, nos dois casos, maior heterogeneidade na susceptibilidade das    popula&ccedil;&otilde;es brasileiras. Com rela&ccedil;&atilde;o &agrave; transmiss&atilde;o    transovariana, no Brasil, h&aacute; registro de apenas uma infec&ccedil;&atilde;o    natural por v&iacute;rus da dengue (DEN-1) em larvas de Ae. <i>albopictus</i>    coletadas no Munic&iacute;pio de Campos Altos, Estado de Minas Gerais.<sup>7,28</sup></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Controle de vetores</b></font></p>     <p><font size="2" face="Verdana"> Pr&aacute;ticas para controle de insetos s&atilde;o    muito antigas.   H&aacute; registro de seu uso na China h&aacute; mais de 2.000 anos.   Basicamente, eram pr&aacute;ticas de controle biol&oacute;gico direcionadas   ao enfrentamento das pragas agr&iacute;colas.</font></p>     <p><font size="2" face="Verdana"> No final do s&eacute;culo XIX, descobriu-se    que certas esp&eacute;cies de insetos e outros artr&oacute;podos eram respons&aacute;veis   pela transmiss&atilde;o de algumas das mais importantes   doen&ccedil;as. Vacinas ou medicamentos efetivos   contra a maioria delas ainda n&atilde;o estavam dispon&iacute;veis   e o controle da transmiss&atilde;o era, todavia, fortemente   centralizado no combate ao vetor. Os primeiros   programas de controle eram baseados em medidas   f&iacute;sicas e na aplica&ccedil;&atilde;o de &oacute;leo ou de verde de Paris   nos criadouros.<sup>29</sup> Atualmente, muitas doen&ccedil;as contam   com vacinas eficazes, caso da febre amarela, ou com   medicamentos geralmente eficientes, caso da mal&aacute;ria.   Todavia, o controle do vetor ainda &eacute; imprescind&iacute;vel   para prevenir diversas doen&ccedil;as &#8211; entre as quais a dengue   &eacute; o melhor exemplo &#8211;, parte integrante de muitos   programas de sa&uacute;de, como os dirigidos &agrave; preven&ccedil;&atilde;o    e controle da mal&aacute;ria e das leishmanioses.</font></p>     <p><font size="2" face="Verdana"> O papel do controle de vetores em Sa&uacute;de    P&uacute;blica &eacute; prevenir a infec&ccedil;&atilde;o mediante o bloqueio ou redu&ccedil;&atilde;o   da transmiss&atilde;o, sendo seus principais objetivos:</font></p>     <p><font size="2" face="Verdana">I) Manejar os problemas existentes, como surtos,   epidemias, alta mortalidade e alta morbidade.</font></p>     <p><font size="2" face="Verdana">II) Prevenir epidemias ou a re-introdu&ccedil;&atilde;o    de doen&ccedil;as.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">III) Reduzir os fatores de risco ambiental da   transmiss&atilde;o.</font></p>     <p><font size="2" face="Verdana">Para que esses tr&ecirc;s objetivos sejam alcan&ccedil;ados,    &eacute; necess&aacute;rio contar com informa&ccedil;&otilde;es sobre o hospedeiro   humano, a doen&ccedil;a, o vetor e o ambiente; e dispor   dos recursos necess&aacute;rios para aplica&ccedil;&atilde;o oportuna.<sup>30</sup>   O controle efetivo dos vetores n&atilde;o pode depender   de um s&oacute; m&eacute;todo. Ao contr&aacute;rio, ele deve dispor   de v&aacute;rias alternativas, adequadas &agrave; realidade local,   que permitam sua execu&ccedil;&atilde;o de forma integrada e   seletiva.<sup>12,30</sup></font></p>     <p><font size="2" face="Verdana">O controle (ou manejo) integrado trata do planejamento   unificado de controle, de acordo com as condi&ccedil;&otilde;es   ambientais e a din&acirc;mica populacional do vetor.   S&atilde;o selecionados os m&eacute;todos de controle apropriados   e as popula&ccedil;&otilde;es do vetor s&atilde;o mantidas em n&iacute;veis    que n&atilde;o causam dano &agrave; sa&uacute;de.<sup>12</sup></font></p>     <p><font size="2" face="Verdana">O controle seletivo do vetor, definido pela Organiza&ccedil;&atilde;o   Mundial da Sa&uacute;de (OMS), pode ser considerado   uma operacionaliza&ccedil;&atilde;o do controle integrado. Ele   inclui a sele&ccedil;&atilde;o das metodologias mais efetivas a serem   utilizadas, com base na realidade local, e compreende   tr&ecirc;s fases: a) defini&ccedil;&atilde;o de local; b) levantamento das   informa&ccedil;&otilde;es necess&aacute;rias; e c) decis&atilde;o sobre o momento   e a forma de sua implementa&ccedil;&atilde;o.<sup>30-33</sup></font></p>     <p><font size="2" face="Verdana">Os componentes do controle integrado de vetores   incluem vigil&acirc;ncia, redu&ccedil;&atilde;o da fonte (ou manejo ambiental),   controle biol&oacute;gico, controle qu&iacute;mico com   uso de inseticidas e repelentes, armadilhas e manejo   da resist&ecirc;ncia a inseticidas.<sup>34</sup></font></p>     <p><font size="2" face="Verdana">O manejo ambiental lan&ccedil;a m&atilde;o de    medidas para eliminar o vetor ou seus focos, ou, ainda, para impedir   o contato homem-vetor, como a elimina&ccedil;&atilde;o de   criadouros, a drenagem e a instala&ccedil;&atilde;o de telas em   portas e janelas.</font></p>     <p><font size="2" face="Verdana"> O controle biol&oacute;gico de mosquitos inclui    o uso de v&aacute;rios predadores, invertebrados aqu&aacute;ticos (como <i>Toxorhynchites</i>    ou cop&eacute;podos) ou peixes (<i>Gambusia sp.</i> e outros) que comem larvas    e pupas. Entre as medidas de controle biol&oacute;gico, tamb&eacute;m se encontram    o uso de pat&oacute;genos, como o fungo <i>Lagenedium giganteum</i>, e de parasitas,    como os nem&aacute;todeos (<i>Romanomermis culicivorax</i> e <i>R. iyengari</i>).<sup>34</sup>    V&aacute;rios agentes de controle biol&oacute;gico apresentaram um bom potencial    para suprimir popula&ccedil;&otilde;es de mosquitos, como o peixe predador Gambusia    affinis,<sup>35</sup> as bact&eacute;rias pat&oacute;genas <i>Bacillus thuringiensis    israelensis</i> (Bti)<sup>36</sup> e <i>Bacillus sphaericus</i> (Bs)<sup>37,38</sup> e    o fungo pat&oacute;geno <i>Metharizium anisopliae</i>.<sup>39</sup></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Inseticidas qu&iacute;micos</b></font></p>     <p><font size="2" face="Verdana"> O controle qu&iacute;mico, com inseticidas de    origem org&acirc;nica ou inorg&acirc;nica, &eacute; uma das metodologias mais   adotadas como parte do manejo sustent&aacute;vel e integrado   para o controle de vetores em Sa&uacute;de P&uacute;blica.<sup>34</sup> O desenvolvimento   de inseticidas que permanecem ativos   por per&iacute;odos longos foi um dos mais importantes   avan&ccedil;os no controle de insetos acontecidos no s&eacute;culo   XX. O primeiro inseticida de efeito prolongado, ou   propriedade residual, foi o dicloro-difenil-tricloroetano   (DDT), um organoclorado desenvolvido durante   a Segunda Guerra Mundial, que, quando aplicado em   paredes e tetos de casas, permanecia ativo contra os   insetos por v&aacute;rios meses.<sup>29</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Os outros compostos org&acirc;nicos pertencem,    principalmente, aos grupos dos organofosforados, carbamatos   ou piretr&oacute;ides. Todos esses grupos atuam sobre o   sistema nervoso central dos insetos e t&ecirc;m sido usados   nos programas de controle de doen&ccedil;as transmitidas   por vetores.<sup>40-42</sup></font></p>     <p><font size="2" face="Verdana"> <b>Organoclorados</b></font></p>     <p><font size="2" face="Verdana"> Os organoclorados s&atilde;o inseticidas que    cont&ecirc;m carbono, hidrog&ecirc;nio e cloro. S&atilde;o classificados em quatro   grupos: difenil-alif&aacute;ticos; hexaclorociclohexanos;   ciclodienos; e policloroterpenos.<sup>43</sup></font></p>     <p><font size="2" face="Verdana">O grupo de organoclorados difenil-alif&aacute;ticos    &eacute; o mais antigo. Ele inclui o DDT, provavelmente a   subst&acirc;ncia qu&iacute;mica mais not&oacute;ria do s&eacute;culo passado.   Em 1948, o entomologista su&iacute;&ccedil;o Paul Muller foi   premiado com o Pr&ecirc;mio Nobel de Medicina pela descoberta   da utilidade do DDT no controle dos vetores   de mal&aacute;ria, febre amarela e muitas outras doen&ccedil;as.<sup>43</sup>   Embora o modo de a&ccedil;&atilde;o do inseticida nunca tenha   sido claramente estabelecido, sabe-se que ele atua no   canal de s&oacute;dio, provavelmente mantendo-o aberto e   destruindo o equil&iacute;brio de &iacute;ons s&oacute;dio e pot&aacute;ssio    dos ax&ocirc;nios, impedindo, assim, a transmiss&atilde;o normal de   impulsos nervosos em insetos e mam&iacute;feros. Seu efeito   &eacute; inversamente proporcional &agrave; temperatura: quanto   mais baixa a temperatura, mais t&oacute;xico &eacute; o DDT para   os insetos.<sup>43</sup></font></p>     <p><font size="2" face="Verdana">O benzenohexacloro (BHC), do grupo dos hexaclorociclohexanos    (HCH), tamb&eacute;m comercializado com o nome de lindano,<sup>43</sup> tem    a&ccedil;&atilde;o semelhante &agrave; do DDT.</font></p>     <p><font size="2" face="Verdana">Os inseticidas ciclodienos, como clordano, aldrin    e dieldrin, surgiram ap&oacute;s a Segunda Guerra Mundial. A maioria deles &eacute;    persistente e est&aacute;vel no solo; e relativamente est&aacute;vel, quando    exposta &agrave; luz solar ou ultravioleta. Por essas caracter&iacute;sticas,    foram usados principalmente como inseticidas para o controle de t&eacute;rmitas    e outros insetos cujas fases larvares alimentam-se nas ra&iacute;zes de plantas.<sup>43</sup>    Os ciclodienos inibem o receptor de &aacute;cido gama-aminobut&iacute;rico (GABA),    que, ap&oacute;s liga&ccedil;&atilde;o do neurotransmissor, aumenta a permeabilidade    dos neur&ocirc;nios aos &iacute;ons cloreto. Os ciclodienos impedem a entrada    dos &iacute;ons cloreto nos neur&ocirc;nios, antagonizando os efeitos do receptor    de GABA. Ao contr&aacute;rio do DDT e dos HCH, os ciclodienos apresentam uma    correla&ccedil;&atilde;o positiva entre temperatura e toxicidade.</font></p>     <p><font size="2" face="Verdana"> Apenas dois policloroterpenos, cujo modo de    a&ccedil;&atilde;o &eacute;   equivalente ao dos ciclodienos, foram desenvolvidos: o   toxafeno, (em 1947) e o estrobane (em 1951) vieram   a ser usados mais intensamente na agricultura.<sup>43</sup>   Os organoclorados, embora tenham sido largamente   adotados pelos programas de controle de   mal&aacute;ria, tiveram seu uso descontinuado e chegaram,   inclusive, a ser proibidos em v&aacute;rios pa&iacute;ses devido a   sua persist&ecirc;ncia no ambiente e ao ac&uacute;mulo em tecidos   do organismo de animais e de humanos.<sup>42,44-46</sup> Essas   proibi&ccedil;&otilde;es e restri&ccedil;&otilde;es referiram-se ao uso agr&iacute;cola   do DDT, embora o inseticida ainda permane&ccedil;a, at&eacute;   os dias de hoje, indicado pela OMS para uso no controle   de vetores.<sup>31,47</sup> O uso descontinuado do DDT em   Sa&uacute;de P&uacute;blica deveu-se, principalmente, a press&otilde;es   internacionais e nacionais cont&iacute;nuas, aliadas a t&aacute;ticas   de comercializa&ccedil;&atilde;o agressivas de produtores de outros   inseticidas, estes mais caros.<sup>48</sup>   A publica&ccedil;&atilde;o de trabalhos relacionados ao DDT   relatando a presen&ccedil;a da subst&acirc;ncia no leite materno   e sua associa&ccedil;&atilde;o com a ocorr&ecirc;ncia de c&acirc;ncer em   humanos<sup>49-51</sup> fez com que a OMS encomendasse a um   grupo de especialistas, reunidos em comit&ecirc;, a revis&atilde;o   completa da literatura sobre o inseticida. As conclus&otilde;es   desse comit&ecirc;, apresentadas em 1993, foram no sentido   de que, <i>&#8220;... em decorr&ecirc;ncia da falta de evid&ecirc;ncia   suficiente e convincente acerca dos efeitos adversos   da exposi&ccedil;&atilde;o ao DDT pelas aplica&ccedil;&otilde;es residuais   para controle de vetores, n&atilde;o existe justificativa   toxicol&oacute;gica ou epidemiol&oacute;gica para alterar a pol&iacute;tica   de uso do produto no controle da mal&aacute;ria e   leishmaniose.&#8221;</i><sup>31</sup> O documento, entretanto, sugere que   os pa&iacute;ses ainda usu&aacute;rios do DDT fa&ccedil;am a substitui&ccedil;&atilde;o   por outros inseticidas, deixando de consider&aacute;-lo como   &uacute;nica possibilidade.</font></p>     <p><font size="2" face="Verdana">Atualmente, v&aacute;rios pesquisadores que    trabalham no controle da mal&aacute;ria advogam o uso do DDT em pa&iacute;ses    com alta transmiss&atilde;o e que n&atilde;o disp&otilde;em de condi&ccedil;&otilde;es    monet&aacute;rias de adquirir outro produto com efeito similar. <sup>48,52</sup>    Durante a reuni&atilde;o do Comit&ecirc; Inter-governamental em Contaminantes    Org&acirc;nicos Persistentes (Cicop) na &Aacute;frica do Sul, no final de 2000,    cuja finalidade era estabelecer um acordo internacional que permitisse implementar    a&ccedil;&otilde;es relativas aos compostos org&acirc;nicos persistentes (COP),    resolveu-se, dada sua import&acirc;ncia para a Sa&uacute;de P&uacute;blica,    pela n&atilde;o-inclus&atilde;o do DDT na lista de COP aos quais haviam sido    impostas restri&ccedil;&otilde;es. Essas recomenda&ccedil;&otilde;es devem perdurar    at&eacute; que se estabele&ccedil;a uma pol&iacute;tica de substitui&ccedil;&atilde;o    do inseticida nos pa&iacute;ses usu&aacute;rios. Para tanto, foi discutida a    necessidade da defini&ccedil;&atilde;o de prazos e apoio financeiro, visto que,    geralmente, os pa&iacute;ses que continuam a usar o DDT n&atilde;o possuem recursos    para arcar com os custos </font><font size="2" face="Verdana">de sua substitui&ccedil;&atilde;o.</font></p>     <p><font size="2" face="Verdana"><b>Organofosforados</b></font></p>     <p><font size="2" face="Verdana">O termo gen&eacute;rico 'organofosforado'    (OP), atualmente usado, inclui todos os inseticidas que   cont&ecirc;m f&oacute;sforo. Esses inseticidas foram descobertos   posteriormente aos organoclorados.<sup>53</sup> No grupo dos   organofosforados, classificamos os inseticidas em tr&ecirc;s   subgrupos: os alif&aacute;ticos (malation, vapona, vidrin,   etc.); os derivados de fenil (etil e metil paration,   fenitrotion, etc.); e os heteroc&iacute;clicos (clorpirifos,   clorpirifos-metil, etc.). S&atilde;o amplamente utilizados   em Sa&uacute;de P&uacute;blica por apresentarem muitas vantagens   sobre os organoclorados, como serem biodegrad&aacute;veis   e n&atilde;o se acumularem nos tecidos. Apresentam, por&eacute;m,   como principal desvantagem, a instabilidade qu&iacute;mica,   o que torna obrigat&oacute;ria a renova&ccedil;&atilde;o peri&oacute;dica de   sua aplica&ccedil;&atilde;o. Al&eacute;m disso, s&atilde;o mais t&oacute;xicos    para os vertebrados que os organoclorados, mesmo em doses   relativamente baixas.<sup>42,43</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">O organofosforado temephos, registrado nos EUA    em 1965, para utiliza&ccedil;&atilde;o em agricultura e controle de mosquitos,    &eacute; o &uacute;nico larvicida desse grupo com uso generalizado no controle    de larvas de mosquitos, recomendado pela OMS para uso em &aacute;gua pot&aacute;vel.<sup>47</sup></font></p>     <p><font size="2" face="Verdana">Os organofosforados atuam inibindo a Acetilcolinesterase    (AChE), importante enzima do sistema nervoso central. Essa enzima &eacute; fosforilada    pelo inseticida, ficando irreversivelmente inativada. A inibi&ccedil;&atilde;o    de AChE resulta no ac&uacute;mulo de acetilcolina nas jun&ccedil;&otilde;es    nervosas (ou sinapses), o que impede a interrup&ccedil;&atilde;o da propaga&ccedil;&atilde;o    do impulso el&eacute;trico. Conseq&uuml;entemente, o sistema nervoso central    continuar&aacute; sendo estimulado, desencadeando o processo de paralisia que    pode culminar com a morte do inseto.</font></p>     <p><font size="2" face="Verdana"><b>Carbamatos</b></font></p>     <p><font size="2" face="Verdana">Os carbamatos s&atilde;o inseticidas derivados    do &aacute;cido carb&acirc;mico e sua comercializa&ccedil;&atilde;o teve in&iacute;cio    por volta dos anos 1960. Entre os mais utilizados, est&aacute; o carbaril. Assim    como os organofosforados, os carbamatos t&ecirc;m a&ccedil;&atilde;o letal r&aacute;pida    sobre os insetos, apesar de um curto poder residual. S&atilde;o sist&ecirc;micos    para as plantas, por serem relativamente sol&uacute;veis em &aacute;gua. Como    os organofosforados, tamb&eacute;m inibem a Acetilcolinesterase, embora, nesse    caso, a rea&ccedil;&atilde;o envolvida seja a carbamila&ccedil;&atilde;o. Apesar    de atuarem de forma muito similar nos sistemas biol&oacute;gicos, apresentam    duas diferen&ccedil;as principais em rela&ccedil;&atilde;o aos organofosforados.    Primeiramente, alguns carbamatos s&atilde;o potentes inibidores da Aliesterase    (uma Esterase alif&aacute;tica, cuja fun&ccedil;&atilde;o exata &eacute; desconhecida)    e apresentam seletividade pronunciada contra as AChE de certas esp&eacute;cies.    A segunda diferen&ccedil;a &eacute; que a inibi&ccedil;&atilde;o da AChE pelos    carbamatos &eacute; revers&iacute;vel.<sup>43</sup></font></p>     <p><font size="2" face="Verdana"> <b>Piretr&oacute;ides</b></font></p>     <p><font size="2" face="Verdana"> Os piretr&oacute;ides sint&eacute;ticos, atualmente    bastante est&aacute;veis, s&atilde;o produzidos em laborat&oacute;rio, a partir de uma   subst&acirc;ncia natural, o piretro, extra&iacute;do de cris&acirc;ntemos.   S&atilde;o biodegrad&aacute;veis, n&atilde;o cumulativos e raramente provocam   intoxica&ccedil;&otilde;es agudas em aves e mam&iacute;feros, embora   possam causar hipersensibiliza&ccedil;&atilde;o e irrita&ccedil;&atilde;o das   mucosas nesses animais. Para os animais aqu&aacute;ticos,   entretanto, s&atilde;o extremamente t&oacute;xicos. Os piretr&oacute;ides   contam, ainda, com as vantagens de serem muito ativos   (atuam em pequenas doses) e desalojantes. Sua &uacute;nica   desvantagem consiste no custo elevado.<sup>42</sup></font></p>     <p><font size="2" face="Verdana">Os piretr&oacute;ides apresentam uma evolu&ccedil;&atilde;o    interessante, dividida em quatro gera&ccedil;&otilde;es. A primeira continha    um s&oacute; produto, aletrina, lan&ccedil;ado no mercado em 1949, cuja s&iacute;ntese    era muito complexa e envolvia 22 rea&ccedil;&otilde;es qu&iacute;micas at&eacute;    o produto final. A segunda gera&ccedil;&atilde;o inclu&iacute;a tetrametrina    (1965), resmetrina (1967), bioresmetrina (1967), bioaletrina (1969) e phonotrina    (1973). A terceira gera&ccedil;&atilde;o inclu&iacute;a fenvalerato e permetrina,    surgidos em 1972-1973, que se tornaram os primeiros piretr&oacute;ides com uso    agr&iacute;cola, em fun&ccedil;&atilde;o de sua alta atividade inseticida e    fotoestabilidade. Na quarta e atual gera&ccedil;&atilde;o, altamente efetiva    em doses baixas, incluem-se bifentrina, lambda-cialotrina, cipermetrina, ciflutrina,    deltametrina, esfenvalerato, fenpropatrina, flucitrinato, fluvalinato, praletrina,    taufluvalinato, teflutrina, tralometrina e zeta-cipermetrina, todos estes inseticidas    fotoest&aacute;veis.<sup>43</sup></font></p>     <p><font size="2" face="Verdana">Os piretr&oacute;ides apresentam modo de a&ccedil;&atilde;o    similar ao do DDT. Atuam, aparentemente, mantendo abertos os canais de s&oacute;dio    das membranas dos neur&ocirc;nios. H&aacute; dois tipos de piretr&oacute;ides:    aqueles que, entre outras respostas fisiol&oacute;gicas, t&ecirc;m um coeficiente    de temperatura negativo, assemelhando-se ao DDT (tipo 1); e os que apresentam    coeficiente de temperatura positivo (tipo 2), ou seja, a mortalidade dos insetos    a eles expostos varia diretamente com o aumento de temperatura. Os piretr&oacute;ides    afetam o sistema nervoso perif&eacute;rico e central do inseto: estimulam as    c&eacute;lulas nervosas a produzir descargas repetitivas e, eventualmente, causam    paralisia. O efeito estimulante dos piretr&oacute;ides &eacute; muito mais pronunciado    que o do DDT.<sup>43</sup></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Resist&ecirc;ncia a inseticidas</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Os inseticidas t&ecirc;m sido bastante usados,    tanto na agricultura e agropecu&aacute;ria quanto na &aacute;rea da Sa&uacute;de   P&uacute;blica. Seu uso continuado tem provocado o aparecimento   de popula&ccedil;&otilde;es resistentes e ocasionado   problemas para o controle de vetores. Resist&ecirc;ncia tem   sido detectada para todas as classes de inseticidas,   afetando, direta e profundamente, a re-emerg&ecirc;ncia das   doen&ccedil;as transmitidas por vetores,<sup>54</sup> pois, apesar dos   importantes avan&ccedil;os alcan&ccedil;ados no desenvolvimento   de m&eacute;todos alternativos, os inseticidas qu&iacute;micos   continuam sendo uma importante ferramenta dos   programas integrados de controle.<sup>34</sup> Nesse contexto, o   monitoramento e o manejo da resist&ecirc;ncia, assim como   o uso de subst&acirc;ncias com modos de a&ccedil;&atilde;o diferentes dos   inseticidas qu&iacute;micos convencionais, s&atilde;o elementos de   suma import&acirc;ncia em qualquer programa de controle   de vetores.<sup>55</sup></font></p>     <p><font size="2" face="Verdana">A resist&ecirc;ncia &eacute; definida pela OMS    como a habilidade de uma popula&ccedil;&atilde;o de insetos tolerar uma dose   de inseticida que, em condi&ccedil;&otilde;es normais, causaria   sua morte. A resist&ecirc;ncia &#8211; dita fisiol&oacute;gica &#8211; &eacute;    uma caracter&iacute;stica gen&eacute;tica, como, por exemplo, a cor dos   olhos. Desse modo, popula&ccedil;&otilde;es de insetos, &aacute;caros e   outros artr&oacute;podes podem, naturalmente, apresentar   uma propor&ccedil;&atilde;o de indiv&iacute;duos que tenham alelos que   lhes confiram resist&ecirc;ncia a um determinado produto   qu&iacute;mico. Cepas resistentes podem surgir como resultado   do uso persistente de pesticidas que matam   indiv&iacute;duos com alelos suscet&iacute;veis e n&atilde;o matam aqueles   que possuam alelos resistentes.</font></p>     <p><font size="2" face="Verdana">A resist&ecirc;ncia a inseticidas pode ser pensada como   um processo de evolu&ccedil;&atilde;o acelerada de uma popula&ccedil;&atilde;o   que responde a uma intensa press&atilde;o seletiva, com a   conseq&uuml;ente sobreviv&ecirc;ncia dos indiv&iacute;duos que possuem   alelos que conferem resist&ecirc;ncia. A resist&ecirc;ncia   &eacute; pr&eacute;-adaptativa, resultado de muta&ccedil;&otilde;es fortuitas.   Assim, um pequeno n&uacute;mero de indiv&iacute;duos possui   caracter&iacute;sticas que permitem sua sobreviv&ecirc;ncia sob   doses de inseticidas normalmente letais. O pr&oacute;prio   inseticida n&atilde;o produz uma mudan&ccedil;a gen&eacute;tica; seu uso   continuado, entretanto, pode selecionar indiv&iacute;duos   resistentes.</font></p>     <p><font size="2" face="Verdana"> Apesar dos v&aacute;rios estudos documentados    sobre a resist&ecirc;ncia, o n&uacute;mero de mecanismos envolvidos &eacute;    bastante pequeno e inclui diminui&ccedil;&atilde;o da taxa de penetra&ccedil;&atilde;o    pela cut&iacute;cula, detoxifica&ccedil;&atilde;o metab&oacute;lica aumentada    e diminui&ccedil;&atilde;o da sensibilidade do s&iacute;tio-alvo. Todos esses    mecanismos s&atilde;o inespec&iacute;ficos e, geralmente, conferem resist&ecirc;ncia    cruzada a outro inseticida estruturalmente relacionado.<sup>55</sup></font></p>     <p><font size="2" face="Verdana"><b>Redu&ccedil;&atilde;o na taxa de penetra&ccedil;&atilde;o    do inseticida</b></font></p>     <p><font size="2" face="Verdana">Este mecanismo de resist&ecirc;ncia, associado    a v&aacute;rios insetos, foi estudado principalmente na mosca dom&eacute;stica.   Quando comparado com outros mecanismos, &eacute;   considerado de import&acirc;ncia secund&aacute;ria por conferir,   t&atilde;o-somente, um baixo n&iacute;vel de resist&ecirc;ncia.<sup>56</sup> N&atilde;o   obstante, em combina&ccedil;&atilde;o com outros mecanismos,   pode resultar em um incremento da resist&ecirc;ncia. A   base bioqu&iacute;mica da redu&ccedil;&atilde;o da taxa de penetra&ccedil;&atilde;o   de um inseticida n&atilde;o est&aacute; clara, embora tenha sido   proposto que a composi&ccedil;&atilde;o prot&eacute;ica do integumento   tenha papel relevante.</font></p>     <p><font size="2" face="Verdana"><b>Resist&ecirc;ncia metab&oacute;lica</b></font></p>     <p><font size="2" face="Verdana">H&aacute; muitos casos descritos de resist&ecirc;ncia    decorrentes do aumento da capacidade de metaboliza&ccedil;&atilde;o   de inseticidas, que leva &agrave; forma&ccedil;&atilde;o de produtos menos t&oacute;xicos.    O incremento do metabolismo pode ser o resultado de altera&ccedil;&atilde;o, seja da enzima existente,   tornando-a mais eficaz na degrada&ccedil;&atilde;o dos inseticidas,   seja dos mecanismos reguladores, que aumentam a   produ&ccedil;&atilde;o de mol&eacute;culas de enzimas j&aacute; dispon&iacute;veis    em insetos suscet&iacute;veis, embora em quantidades muito   pequenas.<sup>54,55</sup></font></p>     <p><font size="2" face="Verdana"> Geralmente, as enzimas envolvidas em metabolismo   de xenobi&oacute;ticos podem ser divididas em enzimas   de Fase 1 e enzimas de Fase 2. As enzimas de Fase 1   reconhecem e atuam diretamente sobre o composto   ex&oacute;geno, introduzindo um grupo polar reativo na mol&eacute;cula,   o que d&aacute; origem a substrato para as enzimas de   Fase 2. A detoxifica&ccedil;&atilde;o que contribui para a resist&ecirc;ncia   a inseticidas &eacute; realizada por enzimas de Fase 1, como   as Monooxigenases e Esterases, ou de Fase 2, caso das   glutationa S-transferases.</font></p>     <p><font size="2" face="Verdana"> <b>Monooxigenases</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> O metabolismo oxidativo aumentado foi implicado   como o principal mecanismo de resist&ecirc;ncia para todas   as classes de inseticidas, com exce&ccedil;&atilde;o dos ciclodienos,   e &eacute; um dos mecanismos mais comuns de resist&ecirc;ncia.   As enzimas associadas com o metabolismo oxidativo   aumentado s&atilde;o as Monooxigenases dependentes de   citocromo P450,<sup>57,58</sup> especialmente concentradas no   intestino, no corpo gorduroso e nos t&uacute;bulos de Malpighi   dos insetos.</font></p>     <p><font size="2" face="Verdana">Evid&ecirc;ncia inicial do envolvimento de metabolismo   oxidativo com a resist&ecirc;ncia pode ser obtida com a   adi&ccedil;&atilde;o, em bioensaios com inseticidas, de inibidores   de Oxidases, como o but&oacute;xido de piperonil (que   atua, aqui, como sinergista). Nesses casos, avalia-se   a capacidade do sinergista de reduzir a magnitude da   resist&ecirc;ncia. Embora essa t&eacute;cnica n&atilde;o seja conclusiva, &eacute;   valiosa como uma primeira indica&ccedil;&atilde;o de que o aumento   da atividade de Monooxigenases est&aacute; contribuindo   para a resist&ecirc;ncia.<sup>57,58</sup></font></p>     <p><font size="2" face="Verdana"><b>Esterases</b></font></p>     <p><font size="2" face="Verdana">V&aacute;rios inseticidas que cont&ecirc;m o    grupamento &eacute;ster na sua estrutura qu&iacute;mica (organofosforados, carbamatos   e piretr&oacute;ides) s&atilde;o suscet&iacute;veis &agrave; rea&ccedil;&atilde;o    de hidr&oacute;lise. As enzimas que catalisam essas rea&ccedil;&otilde;es s&atilde;o coletivamente   chamadas de Hidrolases, ou Esterases. S&atilde;o tamb&eacute;m   chamadas Carboxilesterases quando hidrolisam   compostos que apresentam &eacute;steres carbox&iacute;licos em sua   estrutura, como a maioria dos organofosforados, que s&atilde;o &eacute;steres    de &aacute;cido fosf&oacute;rico.<sup>54,59</sup> O envolvimento das   Esterases com a resist&ecirc;ncia pode ser verificado com   a adi&ccedil;&atilde;o de inibidores em ensaios com os inseticidas,   como o S,S,S-tributil fosforotioato (DEF).<sup>54,59</sup></font></p>     <p><font size="2" face="Verdana"> <b>Glutationa S-transferases (GST)</b></font></p>     <p><font size="2" face="Verdana"> S&atilde;o enzimas multifuncionais capazes de    detoxificar   um grande n&uacute;mero de xenobi&oacute;ticos. Essas enzimas   catalisam a conjuga&ccedil;&atilde;o do grupo hidrof&iacute;lico SH da   glutationa reduzida (GSH) ao centro eletrof&iacute;lico de   compostos lipof&iacute;licos.<sup>60</sup> V&aacute;rias formas dessas enzimas   s&atilde;o conhecidas em mosquitos, mosca dom&eacute;stica,   Drosophila e outros insetos.<sup>61-63</sup></font></p>     <p><font size="2" face="Verdana"> <b>Altera&ccedil;&atilde;o do s&iacute;tio-alvo</b></font></p>     <p><font size="2" face="Verdana"> Todos os inseticidas qu&iacute;micos descritos    at&eacute; aqui atuam no sistema nervoso central, em diferentes s&iacute;tios-alvo.    Resist&ecirc;ncia de uma popula&ccedil;&atilde;o de insetos pode ser decorrente    de altera&ccedil;&atilde;o desses s&iacute;tios, de forma a impedir &#8211;    ou dificultar &#8211; a liga&ccedil;&atilde;o com o inseticida.</font></p>     <p><font size="2" face="Verdana"> <b>Acetilcolinesterase (AChE)</b></font></p>     <p> <font size="2" face="Verdana">&Eacute; o s&iacute;tio-alvo de organofosforados    e carbamatos.<sup>60</sup>   Essa enzima &eacute; a respons&aacute;vel pela degrada&ccedil;&atilde;o de acetilcolina,   neurotransmissor que, quando presente na   fenda sin&aacute;ptica, promove a propaga&ccedil;&atilde;o do impulso   nervoso, uma vez que provoca a abertura de canais   de s&oacute;dio na c&eacute;lula p&oacute;s-sin&aacute;ptica. Em situa&ccedil;&atilde;o    normal,   ap&oacute;s a cessa&ccedil;&atilde;o do est&iacute;mulo, a acetilcolina &eacute;    removida   por recapta&ccedil;&atilde;o ou por degrada&ccedil;&atilde;o enzim&aacute;tica,    sendo   a acetilcolinesterase a enzima respons&aacute;vel. Organofosforados   e carbamatos atuam inibindo a AChE e,   em conseq&uuml;&ecirc;ncia, a acetilcolina permanece na fenda   sin&aacute;ptica e o impulso n&atilde;o cessa, levando o inseto &agrave;   morte. Nestes casos, a resist&ecirc;ncia est&aacute; relacionada   com afinidade reduzida da AChE pelo inseticida, o   que permite a interrup&ccedil;&atilde;o normal &#8211; ou quase &#8211; do   est&iacute;mulo nervoso.<sup>55,60,64</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> <b>Canais de s&oacute;dio</b></font></p>     <p><font size="2" face="Verdana"> S&atilde;o os principais s&iacute;tios-alvo    dos piretr&oacute;ides e de alguns   organoclorados &#91;como os difenil-alif&aacute;ticos (DDT)   e o hexaclorociclohexano (BHC)&#93;. A liga&ccedil;&atilde;o desses   inseticidas mant&eacute;m os canais de s&oacute;dio na conforma&ccedil;&atilde;o   aberta e, conseq&uuml;entemente, h&aacute; propaga&ccedil;&atilde;o cont&iacute;nua   do impulso nervoso, podendo levar o inseto &agrave; morte.   A resist&ecirc;ncia &eacute; resultante de sensibilidade reduzida do   canal de s&oacute;dio a esses compostos.<sup>43,60,65</sup></font></p>     <p><font size="2" face="Verdana">Mais conhecido como mecanismo <i>knockdown</i>   (ou kdr), esse tipo de resist&ecirc;ncia a DDT e piretr&oacute;ides   foi registrado para v&aacute;rias esp&eacute;cies<sup>66</sup> mas &eacute; melhor   caracterizado em moscas dom&eacute;sticas, para as quais   diversas variantes de kdr s&atilde;o descritas, inclusive o   fator super-kdr.<sup>67</sup></font></p>     <p><font size="2" face="Verdana">Por causa da resist&ecirc;ncia cruzada entre    DDT e piretr&oacute;ides,   ensaios biol&oacute;gicos que identificam resist&ecirc;ncia   a ambas as classes de inseticidas podem ser &uacute;teis como   um indicador de resist&ecirc;ncia do tipo kdr.</font></p>     <p><font size="2" face="Verdana"> <b>Receptores do &aacute;cido gama-aminobut&iacute;rico    (GABA)</b></font></p>     <p><font size="2" face="Verdana"> S&atilde;o o s&iacute;tio-alvo dos ciclodienos    e policloroterpenos (organoclorados). Pertencem a uma superfam&iacute;lia de    receptores presentes nas jun&ccedil;&otilde;es sin&aacute;pticas do sistema    nervoso central e das sinapses neuromusculares de insetos.<sup>60</sup> Os inseticidas    atuam sobre os receptores de GABA, impedindo a entrada de &iacute;ons cloro    para o meio intracelular e, com isso, provocando a emiss&atilde;o de impulsos    espont&acirc;neos que levam &agrave; contra&ccedil;&atilde;o muscular, convuls&otilde;es,    paralisia e morte. A resist&ecirc;ncia, ocasionada por insensibilidade do receptor    de GABA aos inseticidas, j&aacute; foi associada com muta&ccedil;&atilde;o de    &uacute;nico par de bases do receptor, ocasionando substitui&ccedil;&atilde;o    de um amino&aacute;cido (alanina por serina).<sup>60</sup></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"> <b>Inseticidas alternativos</b></font></p>     <p><font size="2" face="Verdana"> Al&eacute;m dos inseticidas qu&iacute;micos    propriamente ditos, outros produtos v&ecirc;m sendo usados no controle de vetores.    Eles pertencem, principalmente, aos grupos dos inseticidas biol&oacute;gicos    e dos reguladores de crescimento. Como exemplo de inseticidas biol&oacute;gicos,    pode-se citar as bact&eacute;rias pat&oacute;genas, que t&ecirc;m sido usadas    no controle de pragas agr&iacute;colas por quase cinco d&eacute;cadas.</font><font size="2" face="Verdana">    Somente por volta dos anos 1970, foram descobertas bact&eacute;rias efetivas    contra insetos de import&acirc;ncia m&eacute;dica, principalmente mosquitos    e simul&iacute;deos.</font></p>     <p><font size="2" face="Verdana"> Em 1964, foi descrita uma cepa de <i>Bacillus    sphaericus</i> (Bs) com efetividade contra mosquitos.<sup>68</sup> Embora seu    espectro de a&ccedil;&atilde;o seja restrito a certos tipos de larvas de mosquito,    sua efic&aacute;cia em &aacute;guas polu&iacute;das tornou-a particularmente    &uacute;til contra esp&eacute;cies de <i>Culex</i>, vetores de filarioses e    de encefalites vir&oacute;ticas. Durante a &uacute;ltima d&eacute;cada, tem    aumentado o uso de Bs em programas de controle de mosquitos que se desenvolvem    em &aacute;guas polu&iacute;das, em &aacute;reas urbanas.<sup>69</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> Outra bact&eacute;ria, o <i>Bacillus thuringiensis    israelensis</i>   (Bti),<sup>70</sup> provou ser t&atilde;o efetiva que, alguns anos depois   de sua descoberta, tornou-se um dos principais componentes   do Programa de Controle de Oncocercose   da &Aacute;frica Ocidental e, posteriormente, passou a ser   usada como uma alternativa para inseticidas qu&iacute;micos   sint&eacute;ticos em muitos programas de controle de   mosquitos.<sup>71</sup></font></p>     <p><font size="2" face="Verdana"> Bti e Bs s&atilde;o bact&eacute;rias entomopatog&ecirc;nicas    cujos esporos apresentam cristais, que produzem pr&oacute;-toxinas. As larvas    de culic&iacute;deos ingerem os cristais, que s&atilde;o dissolvidos no intestino    alcalino do inseto. As proteases digestivas clivam as pr&oacute;-toxinas presentes    nos cristais e ativam seu componente inseticida. Os pept&iacute;deos t&oacute;xicos    resultantes agem sobre o epit&eacute;lio intestinal das formas imaturas do vetor,    promovendo a diminui&ccedil;&atilde;o do peristaltismo e, conseq&uuml;entemente,    a interrup&ccedil;&atilde;o da alimenta&ccedil;&atilde;o e a morte da larva.<sup>72,73</sup>    Bti &eacute; um dos larvicidas recomendados pela OMS para uso em &aacute;gua    pot&aacute;vel com objetivo de controlar larvas do <i>Ae. <i>aegypti</i></i>,<sup>47</sup>    sendo, portanto, um dos substitutos poss&iacute;veis para o temephos.</font></p>     <p><font size="2" face="Verdana"> Produtos &agrave; base de Bti t&ecirc;m sido    usados em programas   de controle de mosquitos e simul&iacute;deos por mais   de 20 anos. Apesar disso, at&eacute; o momento, n&atilde;o houve   registro de resist&ecirc;ncia, provavelmente porque v&aacute;rias   prote&iacute;nas com atividade inseticida est&atilde;o presentes   nesses cristais. No caso de Bs, cujo ingrediente ativo   principal &eacute; uma &uacute;nica toxina, a resist&ecirc;ncia j&aacute; se    desenvolveu   em algumas popula&ccedil;&otilde;es na &Iacute;ndia, no Brasil e   na Fran&ccedil;a. Assim, o potencial para o desenvolvimento   de resist&ecirc;ncia com o uso mais difundido de Bs &eacute; alto.   Recentes estudos mostraram, no entanto, que essa   resist&ecirc;ncia pode ser alvo de manejo, mediante esquema   de rota&ccedil;&atilde;o de produtos &agrave; base de Bs e de produtos &agrave;   base de Bti ou outros larvicidas.<sup>69,71</sup></font></p>     <p><font size="2" face="Verdana">Os reguladores de crescimento (ou IGR, sigla    derivada de <i>Insect Growth Regulator</i>), que atuam no desenvolvimento e    na reprodu&ccedil;&atilde;o dos insetos, tamb&eacute;m s&atilde;o considerados    inseticidas alternativos. Os IGR mais utilizados no controle de mosquitos pertencem    ao grupo das benzoil-fenil-ur&eacute;ias (BPU, inibidores de s&iacute;ntese    de quitina) ou s&atilde;o compostos quimicamente relacionados ao horm&ocirc;nio    juvenil natural de insetos, designados como an&aacute;logos de horm&ocirc;nio    juvenil (AHJ).<sup>74</sup> Em geral, os IGR apresentam altos n&iacute;veis    de atividade e efic&aacute;cia no controle de v&aacute;rias esp&eacute;cies    de insetos, em diferentes <i>habitat</i>.<sup>75</sup></font></p>     <p><font size="2" face="Verdana"> As BPU inibem a s&iacute;ntese de quitina nos    insetos,<sup>76</sup>   resultando em interfer&ecirc;ncia com a forma&ccedil;&atilde;o de   cut&iacute;cula a cada vez que o inseto inicia a muda.<sup>77</sup> Isso   ocorre porque a cut&iacute;cula apresenta quitina em sua   composi&ccedil;&atilde;o. Entre os inibidores da s&iacute;ntese de quitina   mais utilizados, encontram-se o diflubenzuron e o   triflumuron, ambos recomendados pela OMS como   larvicidas.<sup>47</sup> Um inibidor da s&iacute;ntese de quitina foi   recentemente aprovado pela OMS para uso em &aacute;gua   pot&aacute;vel.<sup>78</sup></font></p>     <p><font size="2" face="Verdana"> Os AHJ interferem com o sistema end&oacute;crino    dos insetos. Vale mencionar que os processos de muda, metamorfose, desenvolvimento    ovariano e aquisi&ccedil;&atilde;o da capacidade reprodutiva nos insetos s&atilde;o    basicamente controlados por um sistema compreendido por tr&ecirc;s horm&ocirc;nios:    o horm&ocirc;nio protoracicotr&oacute;pico (PTTH), produzido pela <i>corpora    cardiaca</i>; a ecdisona, ou 'horm&ocirc;nio da muda', sintetizada pelas gl&acirc;ndulas    protor&aacute;cicas nos insetos imaturos (e, nos mosquitos adultos, pelos ov&aacute;rios);    e o horm&ocirc;nio juvenil (HJ), sesquiterpen&oacute;ide produzido na <i>corpora    allata</i>.<sup>79,80</sup> O papel dos horm&ocirc;nios na fisiologia da muda    foi inicialmente descrito por Wigglesworth, na d&eacute;cada de 1930.<sup>81-84</sup></font></p>     <p><font size="2" face="Verdana"> Nos est&aacute;gios imaturos, a ecdisona, produzida    em   resposta ao PTTH, atua na indu&ccedil;&atilde;o da muda, enquanto   o HJ confere o car&aacute;ter juvenil aos est&aacute;dios subseq&uuml;entes.   No &uacute;ltimo est&aacute;gio larvar, quando apenas a ecdisona   est&aacute; presente, ocorre a metamorfose para o est&aacute;gio   adulto (na aus&ecirc;ncia de HJ). No adulto, tanto a ecdisona   quanto o HJ t&ecirc;m papel na produ&ccedil;&atilde;o dos ovos.<sup>80</sup></font></p>     <p><font size="2" face="Verdana"> Os AHJ, ou terpen&oacute;ides, atuam sobre o    desenvolvimento   dos insetos, inibindo a emerg&ecirc;ncia dos adultos.   <sup>77</sup> Entre os produtos pertencentes a essa classe, a   OMS recomenda, para controle de larvas de mosquitos,   methoprene e pyriproxifen.<sup>47</sup></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Methoprene &#91;isopropil (2E, 4E)-11-metoxi-3,7,11-    trimetil-2,4-dodecadienoato&#93; foi primeiramente registrado em 1975 e &eacute;    um dos mais antigos an&aacute;logos de horm&ocirc;nio juvenil desenvolvidos,    sendo um dos produtos recomendados pela OMS para uso em &aacute;gua pot&aacute;vel,    com prop&oacute;sito de controle do <i>Ae. aegypti</i>.<sup>47</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">V&aacute;rios estudos demonstraram que a maioria    das esp&eacute;cies n&atilde;o-alvo n&atilde;o era afetada pelos AHJ,<sup>85-88</sup> embora    tenha sido detectado um decr&eacute;scimo na densidade de popula&ccedil;&otilde;es    de Chironomidae e de Psychodidae ap&oacute;s aplica&ccedil;&atilde;o de methoprene.<sup>85</sup></font></p>     <p><font size="2" face="Verdana"> Embora os IGR possam ser um importante elemento   no manejo da resist&ecirc;ncia a inseticidas, uma   vez que atuam de maneira diferente dos inseticidas   tradicionais, j&aacute; existem registros de resist&ecirc;ncia a esses   compostos. A resist&ecirc;ncia aos IGR est&aacute; relacionada &agrave;s Monooxigenases<sup>54,89</sup>    e foi detectada, principalmente,   na mosca dom&eacute;stica.<sup>90,91</sup></font></p>     <p><font size="2" face="Verdana"> A variedade de inseticidas dispon&iacute;veis    para o controle   de vetores de import&acirc;ncia m&eacute;dica &eacute; reduzida. Aliados   a isso, a resist&ecirc;ncia a produtos convencionais e o   potencial desenvolvimento de resist&ecirc;ncia a reguladores   do desenvolvimento de insetos indicam a necessidade   de um controle racional de vetores que considere os   diferentes componentes do controle integrado.   Nesse contexto, a utiliza&ccedil;&atilde;o de inseticidas deve ser   vista como uma ferramenta complementar &agrave; vigil&acirc;ncia   e &agrave;s a&ccedil;&otilde;es de redu&ccedil;&atilde;o de criadouros. Ademais,    o   levantamento de dados relativos &agrave; resist&ecirc;ncia das popula&ccedil;&otilde;es   de vetores e de seus mecanismos &eacute; importante   para que a aplica&ccedil;&atilde;o de inseticidas no campo tenha a   melhor rela&ccedil;&atilde;o custo-benef&iacute;cio.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Refer&ecirc;ncias bibliogr&aacute;ficas</b></font></p>     <!-- ref --><p><font size="2" face="Verdana">1. Bancroft TL. On the etiology of dengue fever.    Australasian Medical Gazette.1906;25:17-18.</font><!-- ref --><p><font size="2" face="Verdana">2. Rodhain F, Rosen L. Mosquito vectors and dengue    virus-vector relationships. In: Gubler DJ, Kuno G. Dengue and dengue hemorragic    fever. New York: CAB International; 1997.</font><!-- ref --><p><font size="2" face="Verdana">3. World Health Organization. Dengue &#91;monography    on the Internet&#93; Geneve: WHO; 2002 &#91;capturado 2002 set. 18&#93;. 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Diflubenzuron   tolerance associated with monooxygenase activity   in field strain larvae of the Australian sheep blowfly   (Diptera: Calliphoridae). Journal of Economic   Entomology 1997;90:15-20.</font><!-- ref --><p><font size="2" face="Verdana">90. Cerf DC, Georghiou GP. Cross resistance to    juvenile hormone analogues in insecticide-resistant strains of <i>Musca domestica</i>    L. Pesticide Science 1974;5: 759-767.</font><!-- ref --><p><font size="2" face="Verdana">91. Zhang L, Harada K, Shono T. Cross resistance    to insect growth regulators in pyriproxyfen-resistant   housefly. Applied Entomology and Zoology 1998;   33:195-197.</font><p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b><a name="endereco"></a><a href="#topo"><img src="/img/revistas/ess/v16n4/seta.gif" border="0"></a>Endere&ccedil;o    para correspond&ecirc;ncia:</b>    <br>   Minist&eacute;rio da Sa&uacute;de, Secretaria de Vigil&acirc;ncia em Sa&uacute;de,    ]]></body>
<body><![CDATA[<br>   Diretoria T&eacute;cnica de Gest&atilde;o,    <br>   Programa Nacional de Controle da    Dengue,    <br>   Esplanada dos Minist&eacute;rios,    <br>   Bloco G, Edif&iacute;cio-sede, 1<sup>o</sup> Andar,    <br>   Bras&iacute;lia-DF.    <br>   CEP: 70058-900    <br>   <i>E-mail:</i><a href="mailto:ima.braga@saude.gov.br">ima.braga@saude.gov.br</a>;    <a href="mailto:dvalle@ioc.fiocruz.br">dvalle@ioc.fiocruz.br</a> </font></p>     <p><font size="2" face="Verdana">Recebido em 20/11/2005    <br>   Aprovado em 04/06/2007</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana"><sup><a name="nota"></a><a href="#topo">*</a></sup>Este    trabalho contou com o apoio da Secretaria de Vigil&acirc;ncia em Sa&uacute;de    e da Funda&ccedil;&atilde;o Oswaldo Cruz do Minist&eacute;rio da Sa&uacute;de,    do Conselho Nacional de Desenvolvimento Cient&iacute;fico e Tecnol&oacute;gico    do Minist&eacute;rio da Ci&ecirc;ncia e Tecnologia, e da Funda&ccedil;&atilde;o    Carlos Chagas Filho de Amparo &agrave; Pesquisa do Estado do Rio de Janeiro.</font></p>      ]]></body><back>
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