The Massachusetts man infected with E-E-E is now in a coma.
The case of Eastern equine encephalitis was the first in the state since 2013.
Health officials say the victim lives in Plymouth County and the Rochester Council of Aging says the man lives in their town.
Family members posted on Facebook saying they don't know where or when their father was bitten by a mosquito.
(Photo CreditL AP Photo/Andre Penner, File)