OBJECTIVE:

To analyze the distribution and natural infection of Biomphalaria snails in the municipality of Belém, aiming to identify critical areas of epidemiological risk for schistosomiasis.

MATERIALS AND METHODS:

This observational, retrospective, and descriptive study was based on the analysis of secondary data recorded by the Malacology Laboratory of Evandro Chagas Institute, from 2020 to 2024. The information was evaluated to map the spatial distribution of snails and identify areas with higher concentration and risk of schistosomiasis occurrence. RESULTS: A total of 5,736 specimens were analyzed, belonging to the species Biomphalaria glabrata, B. straminea, and B. tenagophila. The natural infection rate was 1.2% (67/5,736), with Schistosoma mansoni detected only in B. glabrata. Spatial analysis revealed critical areas in the administrative districts DAGUA and DASAC, as well as foci near tourist sites in the city. The results contribute to strengthening health and environmental surveillance in Belém, especially at a strategic moment for the city, which will host COP30.

CONCLUSION:

The identification of foci near tourist areas highlights the need for integrated preventive actions to protect the population and visitors of the capital of Pará.