Mosquito-borne illnesses spread to people by the bite of an infected mosquito. Examples include West Nile Virus (WNV) or Eastern Equine Encephalitis (EEE) virus. The season for mosquito borne illness in Boston is summer through early fall.
As of July 20, 2023, the risk level for West Nile Virus in Boston is: moderate.
What it means: Infection with West Nile Virus is likely or has already occurred.
What you can do to prevent WNV infection:
- Be prepared: Know your risk -check this page regularly, repair screens, clean up to get rid of mosquito breeding sites, be aware of stagnant water on private property (e.g. unused swimming pools) and consult the local board of health.
- Wear long sleeves and long pants from dusk to dawn when weather permits
- Use mosquito netting on baby carriages and playpens
- Wear mosquito repellent when outdoors, especially between dusk and dawn
- Dump standing water twice weekly
- People over 50 or those who are immune compromised should adjust outdoor activity to avoid peak mosquito hours (from dusk to dawn)
What we do
BPHC partners with the Suffolk County Mosquito Control Project (SCMCP) to protect Boston residents from mosquito-borne disease transmission. The SCMCP collects mosquito samples in traps every week during the summer and early fall. These traps are throughout the City. They test the samples at the Hinton State Laboratory to determine if WNV or EEE virus is present.
Information from mosquito collections helps determine where to put extra precautions to keep Boston residents safe. This may include truck mounted aerosol spraying to control adult mosquito populations.
Positive Collection Results: Summer 2022-23
Mosquito spraying happens between dusk and 11:30 p.m. on scheduled days in targeted areas of the City (depending on weather).
SCMCP advises that if people see a spray truck approaching, they should go indoors for a few minutes. Residents should close any windows that face the street during scheduled spraying. View more information on spraying.
Application to exclude property from mosquito spraying
Residents can file to have their property excluded from spraying at any time of the year. You can file electronically through the Massachusetts Department of Agricultural Resources (MDAR) or mail a paper form to MDAR. For questions, call Juan Carlos Gutierrez at 617-626-1723 or email Juan.Gutierrez@state.ma.us.