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The original item was published from 10/5/2023 2:40:35 PM to 10/10/2023 9:09:30 AM.

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Posted on: October 5, 2023

[ARCHIVED] West Nile Virus Detected in Amherst

Mosquito Disease

The Massachusetts Department of Public Health (MDPH) announced Oct. 4, 2023 that West Nile virus (WNV) has been detected through a positive sample from one mosquito in the Town of Amherst. 

WNV is most commonly transmitted to humans by the bite of an infected mosquito. The mosquitoes that carry this virus are common throughout the state and are found in urban as well as more rural areas. While WNV can infect people of all ages, people over the age of 50 are at higher risk for severe infection. 

The risk level in Amherst is low as indicated on the state’s Risk Level Map, which is updated regularly. 

Because cooler temperatures will be arriving soon, the likelihood of disease transmission is low. However, the Town of Amherst Public Health Department recommends that community members continue to take measures to prevent mosquito-borne illness. Using insect repellent and wearing long sleeves and long pants from dusk to dawn is recommended until temperatures consistently fall below 50 degrees in the evening. Although mosquitoes are not killed until a hard frost occurs, they are extremely unlikely to be active when temperatures fall below 50 degrees. There is no prohibition on outdoor events and activities on town properties and fields.


The Town of Amherst Public Health Department will continue to work closely with MDPH and will keep the public updated with new information as it becomes available.

You can reach the Amherst Public Health Department: 413-259-3077 or by email:

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