On August 27, the Massachusetts Department of Public Health announced that, due to several human cases of West Nile virus (WNV) in the Commonwealth, communities in Middlesex, Norfolk, and Suffolk counties — including Cambridge — are at high risk for WNV. In addition, four reported human cases of mosquito-borne eastern equine encephalitis (EEE), a potentially fatal illness, have occurred in Massachusetts this summer.
The Massachusetts Executive Office of Health and Human Services updates risk levels daily. For Cambridge residents, the current risk level of WNV is considered “high,” while the risk of EEE is “remote.” But the risk may change or be higher where you live or work. Aerial spraying has already begun in areas south and west of Cambridge, where risks are higher.
While current risk levels for mosquito-borne illnesses are high, MIT Health recommends taking steps to reduce your chances of being bitten. In addition to using mosquito repellant, MIT Health recommends covering up with long-sleeved shirts, loose pants, and socks if you are going to be outdoors in the early mornings or evenings, when mosquitos are most active.
Precautions are especially important for student-athletes and others who are outside for evening games, practices, and events, notes Deputy Chief Health Officer Shawn Ferullo. “We’ve asked coaches to remind players about the importance of using mosquito repellant and to make repellent available at practices and games,” he says.
Clinicians at MIT Health are alert to possible cases of mosquito-borne illnesses, Ferullo continues. Both WNV and EEE may begin with flu-like symptoms such as fever, headache, nausea, and muscle aches. WNV often includes a skin rash, and serious cases of EEE may include the sudden onset of severe neurological symptoms. While WNV can cause severe illness in individuals older than 60, younger people generally recover with no complications.
The risk period will most likely continue until the first hard frost, Ferullo says, and that probably won’t occur until early November or later.
More information on mosquito-borne illnesses is available from the Cambridge Public Health Department and the Massachusetts Department of Public Health.