Most people bitten by a WNV infected mosquito show no symptoms of illness. In 2012, there were 33 cases and two deaths, the county Health Department reported.
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The state Department of Environmental Management said Tuesday that 117 mosquito samples from 37 traps set statewide on September 14 came back negative for both West Nile and Eastern Equine encephalitis.
The victim was a resident of Suffolk County, who likely contracted the virus in the Suffolk County area.
Additional cases of West Nile virus are expected until after the first hard freeze.
There have been 24 cases of West Nile reported in Pennsylvania this year, up from 13 in 2014.
The risk of further infections in the Suffolk County cities of Boston, Chelsea, Revere, and Winthrop remains high, health officials said, noting that another Boston-area man in his 40s was infected earlier this month, and multiple mosquitoes have been detected with the virus in the area.
The Mississippi State Department of Health confirms one new human case of West Nile virus. The infections were confirmed with testing at the Massachusetts State Public Health Laboratory.
In 2014, there were six human cases of WNV infection identified in Massachusetts.
Use a recommended mosquito repellent that contains DEET while you are outdoors.
DPH urges residents to avoid the outdoors during peak mosquito hours, from dusk to dawn, and wear long sleeves and trousers to keep skin covered. Symptoms tend to include fever and flu-like illness. Water that is stagnant for more than seven days is an ideal breeding site for mosquitoes.
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The virus can also affect horses, and owners are encouraged to contact their veterinarian for more information.
