The Massachusetts Department of Public Health (DPH) confirmed Tuesday the state’s first human case of West Nile Virus (WNV) this year in a woman in her 70s from Middlesex County.
Health officials said the woman was likely exposed in the county, where mosquito activity remains elevated.
Understanding West Nile Virus
The Centers for Disease Control and Prevention (CDC) identifies West Nile Virus as a mosquito-borne illness. Most infections are mild, with symptoms such as fever, headache, body aches, vomiting, diarrhea, or rash. Severe cases can affect the central nervous system and may result in hospitalization or even death.
“West Nile virus can be a very serious disease, and its presence in mosquitoes remains high right now in Massachusetts,” said Public Health Commissioner Dr. Robbie Goldstein. “While September brings cooler weather and back-to-school routines, the risk of WNV will remain elevated for some time. Residents should continue to take precautions to avoid mosquito bites.”
Mosquitoes carrying the virus were first detected in June. Since then, DPH has identified 319 positive mosquito samples across Barnstable, Berkshire, Bristol, Dukes, Essex, Franklin, Hampden, Middlesex, Norfolk, Plymouth, Suffolk, and Worcester counties. Officials also confirmed one infected goat.
Communities at Risk
Ten communities in Suffolk and Middlesex counties are classified as high risk for WNV, while 193 communities across 11 counties are at moderate risk.
“The mosquitoes will be with us until the first hard frost,” said State Epidemiologist Dr. Catherine M. Brown. “People should use mosquito repellent with an EPA-registered ingredient, wear clothing that reduces exposed skin, and consider rescheduling outdoor activities in the evening or early morning.”
Protecting Yourself and Animals
Public health officials recommend the following steps to reduce risk of infection:
- Use insect repellent containing EPA-registered ingredients such as DEET.
- Avoid outdoor activities between dusk and dawn, peak mosquito biting hours.
- Wear long-sleeved shirts, pants, and socks when outside.
- Eliminate standing water around the home.
- Ensure window screens are intact.
- Shelter animals to reduce exposure.
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