EEE virus is transmitted to humans, horses, birds and other animals during bites from infected mosquitoes, the health department said.
Mosquitoes get the virus by feeding on infected birds.
It can't be transmitted person-to-person, between animals or between humans and animals. However, an EEE positive horse in the area confirms there are infected mosquitoes that could transmit the virus to people and other animals, the health department said.
Most people infected with EEE do not have symptoms, but some can develop encephalitis which is inflammation of the brain. It begins with sudden onset of fever, headache, chills and vomiting, the health department said.