West Nile Virus Symptoms in NYC After First Case Reported

New York City has reported its first human case of West Nile virus in 2026, prompting health officials to urge residents to prevent mosquito bites during peak season. The infected individual spent time outdoors in the city and elsewhere. Mosquitoes carrying the virus have been detected in all five boroughs since June, with over 1,000 positive pools citywide. Nationwide, 222 human cases have been reported across 33 states, with most in Arizona, Texas, and California. Most infected people show no symptoms, but mild illness can include fever, headache, and fatigue. Severe neuroinvasive disease affects about one in 150 people, with older adults at highest risk. Prevention includes using repellent and eliminating standing water.