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A biting problem: Twice as many NYC mosquito pools testing positive for dangerous West Nile virus this summer, health officials say
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amNewYork
Since West Nile Virus was first detected in the United States in 1999 in NYC, the median age of people infected with documented cases in the city is around 65 years old, according to city health data.
Many individuals infected with West Nile virus, around 80%, never show any discernible symptoms, according to Dr. Anna Durbin, a professor of International Health, specializing in epidemiology at Johns Hopkins University.
The city conducts annual surveillance of mosquito activity, testing groups of trapped mosquitoes known as “pools” for the presence of West Nile virus.
So far, out of 2,040 pools tested, West Nile virus was detected in 612 across the city, compared with 326 by the same time in 2025.
“The detection of West Nile virus in mosquitoes demonstrates that New York City’s mosquito surveillance system is working exactly as intended,” said Martin.