The season’s first case of Eastern Equine Encephalitis, or EEE, was detected in mosquito samples in Kingston.
The state department of public health says that the finding increases the risk level of EEE in Carver, Halifax, Kingston, and Plympton.
No human or animal cases have been detected so far this year.
Triple E and West Nile Virus are spread through bites by an infected mosquito.
Triple E is often a fatal disease that can affect people of all ages.
Health officials advise residents to prevent mosquito bites by using bug repellent, wear long sleeves and pants, and socks, particularly from dusk to dawn.
They also said that all standing water should be discarded including bird baths and wading pools.