Eastern Equine Encephalitis was detected last month in Wicomico and Worcester Counties.
It’s a mosquito born virus that can cause some mild health problems but also could turn serious and cause death.
WBOC reports that the Wicomico County Health Department says on average only five to 10 people are affected by the virus.
Dennis DeCintio with the Department says that number there is a high fatality rate of around one third.
Otherwise symptoms can include chills, muscle aches and join pain.
Other effects can be more severe such as brain swelling and hospitalization.
There is no vaccine or anti-viral medication for the virus.