A rare but deadly mosquito-borne virus has prompted nearly a dozen Massachusetts communities to impose nighttime curfews and other restrictions. What Happened: Massachusetts health officials confirmed the state’s first human case of eastern equine encephalitis (EEE) this year. The patient, a man in his 80s, was exposed in Worcester County. Some communities are now at high or critical risk, the health agency announced on Saturday. Plymouth, located about 40 miles south of Boston, has closed all public parks and fields from dusk until dawn. “We have not seen an outbreak of EEE for four years in …