Mosquitoes can carry Eastern Equine Encephalitis (EEE), a virus of birds usually found in eastern North Carolina. It may cause headache and muscle ache, seizures, coma and death. There is a vaccine to protect horses.
They can also carry LaCross encephalitis (LAC), a virus of small mammals like squirrels and chipmunks usually found in the very western part of the state. LAC usually causes mile flu-like symptoms. Young children may experience seizure and coma.