Mosquito on arm with WARNING written across

Mosquitoes carrying West Nile Virus (WNV) have recently been found in Lexington and surrounding towns.

Seminars on mosquitoes, the diseases they carry, and how to prevent bites

Last year, over 5% of the mosquitoes tested in Massachusetts carried WNV, according to the Massachusetts Department of Public Health (MDPH).

Culex mosquitoes are the primary carriers of WNV, which humans can catch from the bite of an infected mosquito. While 80% of people infected have no symptoms, people over the age of 50 are at higher risk for severe infection. Read about the symptoms of WNV infection on the Centers for Disease Control (CDC) website.

Culex mosquitoes are common throughout the state, in cities as well as suburbs and rural areas. Culex mosquitoes are active during the day, and prefer to lay their eggs in catchbasins, clogged rain gutters, unused tires, buckets and other water holding containers

Eliminate their breeding places by:

  • Cleaning rain gutters and drains
  • Emptying unused flowerpots, wading pools and other sources of standing water.
  • Changing the water in birdbaths frequently

Don't Get Bitten

  • Culex mosquitoes are most active between dusk and dawn - consider scheduling outdoor activities for other times
  • Make sure your window and door screens are intact.
  • Wear long sleeves, long pants and socks - these can be treated with permethrin to further protect you
  • Use insect repellant containing DEET, picaridin, or oil of lemon eucalyptus according to directions
  • Find out more about insect repellant from the CDC website

For more information please contact Gerard Cody, Public Health Director at 781-698-4533 or