Mosquitos in Towns Near Watertown Have Tested Positive for West Nile Virus

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The Massachusetts Department of Public Health (MDPH) has notified the Watertown Health Department that mosquitoes in our general geographic region have tested positive for West Nile Virus for the last two weeks, thus elevating the risk for human exposure to West Nile Virus.

The warm and intermittent wet weather patterns have contributed to conditions that are favorable for the species of mosquitoes responsible for the spread of West Nile Virus. The Watertown Health Department urges that precautions against mosquito exposure need to be taken.

Public health surveillance is conducted for mosquito-borne viruses – viruses that are carried and spread by mosquitoes. These viruses include West Nile Virus (WNV) and Eastern Equine Encephalitis (EEE).

Mosquitoes get WNV and EEE by biting infected birds. People and animals can get these diseases by being bitten by an infected mosquito. There is no evidence that a person can get these viruses from handling live or dead infected birds or animals. However, gloves should be worn when handling any dead animals, and double plastic bags should be used to discard them in the trash.

While both diseases may cause encephalitis or swelling of the brain, most people bitten by mosquitoes carrying West Nile Virus will experience no symptoms or very mild symptoms and will recover on their own. People over 50 years of age have the highest risk of severe WNV disease. People who are bitten by mosquitoes carrying EEE tend to experience more severe symptoms.

Severe symptoms of both diseases include high fever, muscle weakness, headache, disorientation, neck stiffness, paralysis, coma, tremors, convulsions and sometimes death. There is currently no vaccine or medical cure for these illnesses. In severe cases, intensive medical therapy can be administered in hospitals.

What is Watertown doing to protect you?

Larvicide has been applied to over 3,400 catch basins to prevent hatching of new mosquitoes. Mosquito traps have been established and mosquito batches continue to be tested for the virus.

For more information about mosquito control, visit the East Middlesex Mosquito Control Project website at

Mosquito-borne virus information is on the MDPH website, at

Spraying to kill mosquitoes may be done, only if necessary, and if recommended by the State. Every effort will be made to notify residents before spraying if this needs to be done.

What can you do to protect yourself?

Avoid exposure to mosquitoes! Be aware of increased mosquito activity between dusk and dawn. If you must be outdoors when mosquitoes are active, wear a long-sleeved shirt, long pants, and socks.

Cover baby carriages and playpens that are outdoors with mosquito netting.

Use a mosquito repellent when outdoors! Repellents that contain DEET are the most effective, although DEET should not be used on infants. The Centers for Disease Control also recommends products which contain the chemical Picaridin, found in Cutter Advanced; or products containing the oil of lemon eucalyptus. Alternatives to DEET that can also be effective for a limited duration of one hour are: citronella; Avon Skin-So-Soft Plus; Buzz Away; neem oil; and soybean oil. If you need help selecting a repellent, one useful tool is available at

Avoid areas that tend to have a lot of mosquitoes, such as wetlands or swampy areas.

Fix holes in window and door screens.

Remove standing or stagnant water in your yard where mosquitoes breed. Check containers, pots, garbage cans, birdbaths, swimming pool covers, old tires, clogged gutters, etc., remove water and invert containers. Ensure that swimming pools are not abandoned and left with standing water.

Repair leaking pipes and outdoor faucets.

Keep your grass cut short and bushes near your house trimmed so that mosquitoes can’t hide.

For further information or to report stagnant water (more than 10 days) or other complaints, please contact the Watertown Health Department at 617-972-6446.

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