Mosquito collapse in Seville halts West Nile virus

Published on May 23, 2026 | Translated from Spanish

Seville records a historic decline in the population of larvae and adult mosquitoes, encouraging data to reduce the risk of West Nile virus transmission. Health authorities confirm the drop in numbers, although they maintain an active alert due to the presence of the pathogen in the area. Surveillance teams continue their monitoring and selective fumigation efforts to prevent outbreaks, according to available official reports.

Technical illustration showing mosquito larvae monitoring station beside a dry Sevillian marshland, field technician in protective gear using digital tablet to record zero larval count, empty sampling trays and stagnant water pools without mosquito activity, microscopic virus particles fading into background, surveillance drone hovering overhead, pale sunlight casting long shadows, photorealistic scientific documentation style, crisp environmental details, sterile clinical atmosphere

Drones and sensors: the technology behind vector surveillance 🦟

Control teams use drones equipped with thermal cameras and multispectral sensors to locate breeding sites in hard-to-reach areas. Historical data analysis and weather forecasting allow adjusting fumigation cycles with biological larvicides. This early warning system, based on artificial intelligence, cross-references variables such as temperature and humidity to anticipate population peaks. The precision of these tools has been key to optimizing resources and reducing the use of chemicals in urban environments.

Mosquitoes on technical leave due to lack of stagnant water 😅

It seems the mosquitoes in Seville have taken forced vacations. Without puddles or still waters to breed in, these little bloodsuckers have had to find other plans. Perhaps now they are sightseeing at the Giralda or protesting in front of City Hall for the lack of job opportunities. The truth is that their massive absence allows us to walk around without looking like a walking repellent advertisement. But let's not celebrate too soon: as soon as the heat and a storm arrive, they will set up their particular sunset disco again.