EEE Virus Detected in Mosquitoes in Hampshire County
EASTHAMPTON — The Massachusetts Department of Public Health (DPH) has confirmed the presence of the eastern equine encephalitis (EEE) virus in mosquitoes collected in Hampshire County. This is the first detection of the virus in the state this year. The positive sample was collected on July 21 in Belchertown.
EEE is a rare but serious and potentially fatal disease that affects people of all ages. It is spread through the bite of an infected mosquito. In 2024, Massachusetts reported four human cases of EEE, including one fatality, as well as four equine cases. As of now, no human or animal cases have been reported in 2025.
The Easthampton Health Department urges residents to take the following preventive measures to reduce the risk of mosquito bites:
• Apply insect repellent when outdoors. Use an EPA-registered repellent containing DEET, permethrin, picaridin, oil of lemon eucalyptus (PMD), or IR3535. DEET should not be used on infants under 2 months old and should be limited to 30% concentration or less for older children. Oil of lemon eucalyptus should not be used on children under 3 years old.
• Avoid outdoor activities during peak mosquito hours. Mosquitoes are most active from dusk to dawn. Try to avoid outdoor activities during these hours, especially in high-risk areas.
• Wear protective clothing. Wearing long sleeves, long pants, and socks when outdoors will help keep mosquitoes away from the skin.
• Eliminate standing water. Mosquitoes lay their eggs in standing water. Limit the number of places around the home for mosquitoes to breed by either draining or discarding items that hold water. Check rain gutters and drains. Empty any unused flowerpots and wading pools, and change the water in birdbaths frequently.
• Install or repair screens. Keep mosquitoes outside by having tightly fitting screens on all windows and doors.
• Protect household animals.