West Nile virus cases surge across the United States, hitting record highs this summer

This summer, the United States saw an early onset of West Nile virus activity and a steep increase in reported infections, reaching a total of 143 cases by early August. Historically, only about ten cases are recorded by the end of June, making the current numbers the most severe in over two decades. Approximately 69% of patients have experienced neuroinvasive disease, which can lead to meningitis, encephalitis, or acute flaccid myelitis and often necessitates hospital care.

While most infected individuals remain asymptomatic or exhibit mild flu-like signs, about one percent develop these serious neurological conditions. The risk of severe disease rises for seniors and immunocompromised persons. Cases have been documented in many states, with Arizona reporting the largest tally, and mosquito testing showing the virus’s presence in locations such as New York City.