A mosquito in Madisonville tested positive for West Nile virus, the first confirmed detection in Cincinnati this year. Health officials found the mosquito through their routine surveillance for mosquito-borne diseases such as West Nile virus, in which they trap and test mosquito samples from neighborhoods throughout the city.

The Cincinnati Health Department has identified West Nile virus in a mosquito for the first time in 2025.The department said Tuesday that a mosquito collected from Madisonville has tested positive for the virus.

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