September 3, 2025 — Massachusetts health officials have confirmed the season’s first human case of West Nile virus in a woman in her 70s who was exposed in Middlesex County.
What’s Happening
The Massachusetts Department of Public Health has identified this as the first human infection recorded statewide this year. Surveillance has already detected West Nile virus in mosquitoes across 12 counties, and even a local goat tested positive earlier this summer.
Elevated Risk Across the State
The virus risk currently stands high in ten communities within Suffolk and Middlesex counties, including parts of Boston and its suburbs. A moderate risk level extends across nearly 200 other towns throughout the state. Authorities warn that, despite cooler fall temperatures and the start of the school year, mosquito activity—and the associated threat—will likely persist until the first hard frost.
Health Advice and Precautions
West Nile virus is spread through mosquito bites and can lead to symptoms like fever, headache, body aches, nausea, vomiting, rash, and swollen lymph nodes. While most people show no symptoms, those aged 50 and older face a greater risk of severe illness.
The public health recommendation remains clear:
- Use insect repellent containing an EPA-registered active ingredient.
- Wear long sleeves and pants when outdoors, especially from dusk to dawn.
- Eliminate standing water and ensure window and door screens are in good repair.
- Consider rescheduling outdoor activities during peak mosquito hours.
State Health Commissioner Robbie Goldstein emphasized the seriousness of the disease, while State Epidemiologist Dr. Catherine Brown reminded residents that “mosquitoes will be with us until the first hard frost.”
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