A Cambridge mosquito tested positive for West Nile virus on Tuesday, but the risk level in the city remains “low,” according to the Massachusetts Department of Public Health. That means an infection of West Nile virus is unlikely.
A state risk map actually puts the risk level for West Nile in Cambridge and Somerville at “remote,” which is below “low.” The nearest community rising to low levels of risk is Weston.
Mosquitoes will be active until the first hard frost, which occurs typically in early November, the health department has said.
In 2018, there were 49 human cases acquired in Massachusetts, a record for the state in a single year. No year since has come close, even when risk became “high” in 2021.
Most human West Nile virus infections are mild with no symptoms, but a small number of people become very sick with encephalitis or meningitis. People over 50, and those with weakened immune systems, are at greatest risk for severe illness – starting with fever and flu-like illness and extending to headache, high fever, neck stiffness, stupor, tremors, muscle weakness and paralysis.
Health officials advise residents to protect themselves against the virus by wearing mosquito repellent and pants and long-sleeved shirts outdoors. People should also consider staying indoors during times of high mosquito activity such as dawn and dusk, and keep screens in good repair. Residents can reduce the mosquito population by draining or eliminating containers that hold water, health officials say.
Information about the virus is on the Public Health Department website.
This post has been corrected to show two mosquitoes have tested positive for West Nile; no humans have been found to be affected.
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