A survey of indoor and outdoor Anopheles density, species composition and circumsporozoite rate of malaria vectors on the Bijagós Archipelago, Guinea-Bissau

A survey of malaria vectors on the Bijagós Archipelago, Guinea-Bissau, reveals that Anopheles melas is the dominant species, accounting for 85.2% of all Anopheles caught, both indoors and outdoors. This suggests it may contribute to year-round malaria transmission in the region. The study also found high hybridization between Anopheles gambiae sensu stricto and Anopheles coluzzii on some islands, with sporozoite rates indicating low but present infection levels (0.86% overall). The research used odour-baited light traps for adult mosquito collection and RFLP-PCR for species identification, providing critical data to tailor effective vector control strategies in this seasonal malaria transmission setting.

Pretorius, E., Jones, R. T., Hutchins, H., Teixeira Da Silva, E., Ceesay, S., Ndiath, M. O., d’Alessandro, U., Rodrigues, A., Logan, J. G., & Last, A. (2025). A survey of indoor and outdoor Anopheles density, species composition and circumsporozoite rate of malaria vectors on the Bijagós Archipelago, Guinea-Bissau. Malaria Journal, 24(1). https://doi.org/10.1186/s12936-025-05372-z