The Department of Public Health announced Friday West Nile virus was found in Middlesex County.
Massachusetts health officials have confirmed a second case of West Nile virus in the state this summer.
The EEE virus has claimed the life of an 85-year-old Weymouth woman.
Spraying in Exeter, New Hampshire started Tuesday morning near Brickyard Pond and the fields across the street after a batch of mosquitoes found nearby tested positive for Eastern Equine Encephalitis (EEE).
Belmont, Waltham, Westport and Whitman have reported finding infected mosquitoes in their towns.
Some public health officials are now saying the coast in clear in their towns after a hard frost has limited the amount of mosquitoes and reduced the threat of West Nile and EEE.
The National Weather Service has issued a freeze watch for just about all the suburbs away from and along the coast Friday night into Saturday morning.
State health officials are confirming a ninth human case of West Nile virus in Massachusetts.
The number of mosquitoes found carrying EEE or West Nile has likely reached record levels in the state this year, according to state public health officials.
Framingham will be sprayed by ground trucks with the East Middlesex Mosquito Control Thursday night. They will target neighborhoods south of Waverly Street.