BOSTON (AP) — Laboratory testing has confirmed the first human case of an eastern equine encephalitis virus infection in Massachusetts this year.

The Department of Public Health announced Monday that the infection occurred in a male under the age of 18 who was exposed to EEE in Plymouth County.

Health officials said the level of risk to the virus in Carver and Middleborough in Plymouth County has been raised to critical. Middleborough Town Manager Robert Nunes said no outdoor activities are permitted on town-owned property from dusk to dawn until further notice.

EEE is a rare but potentially fatal disease.