The state Department of Public Health said a mosquito sample in one town tested positive late last week.
SHREWSBURY, MA — A Central Massachusetts town became the first place in the state to have a mosquito sample test positive for West Nile virus.
The state Department of Public Health said that WNV was detected in a sample collected in Shrewsbury in Worcester County late last week.
"Mid-June is earlier than we typically first find West Nile virus-infected mosquitoes in Massachusetts," Public Health Commissioner Robbie Goldstein said. "WNV activity is very difficult to predict in advance, which is why the mosquito surveillance system is so important.
"This early detection serves as a reminder that people should take steps to prevent mosquito bites. WNV can cause serious illness and there are simple things that you can do to protect yourself and your loved ones."
Mosquito bites are the most common way of transmitting WNV. There were 19 human cases of WNV last year when the first mosquito samples to test positive were collected in late June.
The DPH said there has been no evidence thus far this year of Eastern equine encephalitis. There were four cases of EEE in 2024.
While WNV can infect people of all ages, people over the age of 50 are at higher risk for severe disease. Most people infected with WNV will have no symptoms. When present, WNV symptoms tend to include fever and flu-like illness. In rare cases, more severe illness can occur.
"Even though this is a little early, it doesn't necessarily mean we will have a bad season," saids tate Epidemiologist Dr. Catherine M. Brown. "We recommend that everyone start using a mosquito repellent with an EPA-registered ingredient, wear clothing to reduce exposed skin, drain standing water, and repair window screens.
"We also encourage everyone to make it a habit to check our online risk level maps for updates on when and where WNV activity is occurring."
Experts recommend using a repellent with an EPA-registered ingredient, such as DEET, permethrin or picaridin, or oil of lemon eucalyptus.
DEET products should not be used on infants under two months of age and should be used in concentrations of 30 percent or less on older children. Oil of lemon eucalyptus should not be used on children under 3.
Peak mosquito hours are at dusk and dawn. Wearing long sleeves, long pants, and socks when outdoors will help keep mosquitoes away from your skin.
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(Scott Souza is a Patch field editor covering Beverly, Danvers, Marblehead, Peabody, Salem and Swampscott. He can be reached at [email protected]. X/Twitter: @Scott_Souza.)