Mass. DPH reports season’s first West Nile virus-positive mosquito sample

BELMONT, Mass. — State health officials have reported this season’s first West Nile virus-positive mosquito samples were detected in Middlesex County.

The Massachusetts Department of Public Health says the two mosquito samples, collected in Belmont on July 7, tested positive for WNV.

This comes just a week after the first sample of Eastern Equine Encephalitis of the season was announced, though no human or animal cases of WNV or EEE have been reported.

The new findings do not elevate the risk level for WNV in the state.

“The first WNV positive mosquito sample has been identified this year in Massachusetts,” said Public Health Commissioner Monica Bharel, MD, MPH. “It is important to remember that WNV can cause very serious illness, especially in individuals over 50 and those who are immune compromised.”

Humans can contract WNV through the bite of an infected mosquito. In 2019, five human cases of the virus were reported, while in 2018 49 people became infected by the virus – the greatest number of cases the Commonwealth has ever had in a single year.

“People have an important role to play in protecting themselves and their loved ones from illnesses caused by mosquitoes,” said State Epidemiologist Dr. Catherine Brown. “The tools for prevention include using a mosquito repellent with an EPA-registered ingredient according to the directions on the label, wearing clothing to reduce exposed skin when weather permits, draining standing water to prevent mosquito breeding and repairing window screens to keep mosquitoes out of your home.”

While people of all ages can contract the virus, people over the age of 50 are at a higher risk for WNV.

Most people infected with WNV will have no symptoms, but when present, WNV symptoms tend to include fever and flu-like illness. In rare cases, more severe illness can occur.

You can prevent mosquito bites by wearing long clothing, using bug spray and avoiding being outside at dawn and dusk, when these insects are more active. Also remember to empty out any receptacle that may collect water - mosquitoes love standing water, making for the perfect place for them to lay their eggs.

This is a developing story. Check back for updates as more information becomes available.

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