CMMCP Vector Spray Events:

updated 9-Sept-10

WNV and/or EEE have been confirmed in 5 CMMCP member towns and one non-member town (Bolton) to date.

Click the links below for a narrative and maps of the spray areas. Please call (508) 393-3055 for additional information.

        BERLIN (WNV) – Aug. 4 & 9, 2010

        AUBURN (WNV) – Aug. 17 & Sept. 7, 2010

        CHELMSFORD (WNV) – Aug. 18, 2010

        LANCASTER (EEE) – Aug 19 & 26, 2010

        BOLTON (EEE) – Aug. 30, 2010

        NATICK (WNV) – Sept. 2 & 10, 2010

Please note: there has been other virus activity in our area in non-member cities and towns. Warren had a horse die of EEE, Worcester has WNV in mosquitoes, and Bolton has both WNV and EEE in mosquitoes.


Positive mosquito results from 2010 can be found on the Arbovirus Surveillance Information web page at

People have an important role to play in protecting themselves and their loved ones from illnesses caused by mosquitoes.

Avoid Mosquito Bites

        Be Aware of Peak Mosquito Hours. The hours from dusk to dawn are peak biting times for many mosquitoes. Consider rescheduling outdoor activities that occur during evening or early morning.

        Clothing Can Help Reduce Mosquito Bites. Wearing long-sleeves, long pants and socks when outdoors will help keep mosquitoes away from your skin.

        Apply Insect Repellent when Outdoors. Use a repellent with DEET (N, N-diethyl-m-toluamide), permethrin, picaridin (KBR 3023), oil of lemon eucalyptus [p-methane 3, 8-diol (PMD)] or IR3535 according to the instructions on the product label. DEET products should not be used on infants under two months of age and should be used in concentrations of 30% or less on older children. Oil of lemon eucalyptus should not be used on children under three years of age.

Mosquito-Proof Your Home

        Drain Standing Water. Mosquitoes lay their eggs in standing water. Limit the number of places around your home for mosquitoes to breed by either draining or discarding items that hold water. Check rain gutters and drains. Empty any unused flowerpots and wading pools, and change water in birdbaths frequently.

        Install or Repair Screens. Keep mosquitoes outside by having tightly-fitting screens on all of your windows and doors.

More information is available on the DPH website: Information about West Nile Virus and Eastern Equine Encephalitis is also available by calling the Epidemiology Program at 617-983-6800.