Mosquito - EEE Information

Current Eastern Equine Encephalitis (EEE) and West Nile Virus (WNV) Information in Massachusetts


Mass. Department of Public Health (MDPH) has reported the first human case of 2020 of WNV from Middlesex County on 8/7/2020.  The onset of illness was 8/2/2020 with a presentation of headache and stiff neck.  The case has recovered. The following cities and towns had WNV positive mosquito samples. Arlington, Belmont, Boston, Brookline, Medford, Middleborough, Needham, Newton, and Watertown. Please click on this link to access risk maps updated with today's positive results..  


MDPH has reported the first human case of 2020 of EEE from Plymouth County and EEE positive mosquito samples have been detected in Franklin, Middlesex and Plymouth Counties. Risk levels have been increased in these regions.  Please check back throughout the season to view risk levels and  findings of EEE and WNV.  

See the latest MDPH Arbovirus Surveillance Program Report HERE.  

Routine mosquito testing began on 6/15/2020 and will continue through October. The Department of Public Health in partnership with Local Mosquito Control Projects will conduct comprehensive surveillance activities state-wide to assess the risk of West Nile Virus (WNV) and EEE in 2020. Risk maps and EEE and WNV detections will be routinely updated. 

At this time, Ashland remains at low risk for both EEE and WNV.  Residents should take personal preventative actions like using repellents and avoiding peak mosquito activity.

Learn about EEE

Eastern Equine Encephalitis (EEE) is a rare but serious disease caused by a virus that can affect people of all ages. EEE is generally spread to humans through the bite of a mosquito infected with the virus.  EEE can cause severe illness and possibly lead to death in any age group; however, people under age 15 are at particular risk.  EEE does not occur every year, but based on a mosquito sampling, a high risk of occurrence of human cases currently exists.  Learn more about EEE and how to protect yourself in this fact sheet HERE.

Central Mass. Mosquito Control Program

The Town of Ashland is a member community of the Central Mass. Mosquito Control Project (CMMCP), a state agency providing services to 44 cities and towns in Middlesex and Worcester counties, offering a full-service, year-round program of mosquito control services.        

A property owner may request CMMCP to spray their property by calling the CMMCP office at 508-393-3055..  Properties that do not request service will not be sprayed. Please use this link to exclude your property from spraying or any part of the program:

Please note that exclusions expire at the end of the calendar year, and must be renewed annually.

To find out which streets are being sprayed on a scheduled date, residents may check the CMMCP website after 3:30 PM at or call the CMMCP phone system at 508-393-3055. Press 0.

CMMCP has made great strides over the years to reduce dependency on spraying with eight key services.  These services, mostly proactive and occur before mosquitoes have hatched from their larval habitat, include: Mosquito Surveillance, Public Education, Ditch Maintenance, Larval Mosquito Control Source Reduction, Beaver Control and Mitigation, Adult Mosquito Control (Spraying), and Research and Efficacy. Learn more about CMMCP and their services HERE.

Central Mass Mosquito Control Project personnel will be in Ashland to respond to residents' concerns about mosquitoes in their area on the following dates:  August 3, 10, 17, 24 and 31.

Protect Yourself and Your Family From EEE and Lyme Disease

This summer, protect yourself from mosquitoes and ticks. Their bites can cause serious illnesses, like EEE and Lyme Disease. When outdoors, use EPA approved repellent and wear protective clothing.  Repair broken doors and window screens with holes. Watch this short video here.  Learn more about tick-borne disease prevention HERE.  

Please see the link below for a presentation by Timothy Deschamps of Central Mass Mosquito Control Program during a recent Board of Health Meeting:

Please see the link below to learn about EEE and West Nile Virus in Horses. Vaccines are available, contact your veterinarian.

Protect Your Horse