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Massachusetts announced season’s first West Nile virus positive mosquito sample

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Christian Fernsby ▼ | November 7, 2019
The Massachusetts Department of Public Health (DPH) announced that West Nile virus (WNV) has been detected in mosquitoes in Massachusetts for the first time this year.
Massachusetts Department of Public Health
America   Massachusetts Department of Public Health
The presence of WNV was confirmed in the Massachusetts State Public Health Laboratory in a mosquito sample that was collected July 3 in the city of Boston in Suffolk County.

Topics: Massachusetts West Nile virus

No human or animal cases of WNV or Eastern Equine Encephalitis (EEE) have been detected so far this year.

There is no elevated risk level or risk-level change associated with this finding.

“The first WNV positive mosquito sample is often identified in Massachusetts sometime during the last week of June or the first week in July,” said DPH State Epidemiologist Dr. Catherine Brown.

“Risk for human infection generally builds through the season with peak risk occurring in August.”