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The rare but potentially fatal mosquito-borne virus has been detected in Massachusetts and Connecticut

A second human case of Eastern equine encephalitis virus infection this year was confirmed in Massachusetts last week, in a young Grafton man. Meanwhile, the first human case of EEE in the state in six years—a man over sixty from southern Plymouth County—reportedly had slipped into a coma.

Transmitted by mosquitoes, EEE is the most dangerous virus spread by insects in North America. While only about seven people contract EEE a year in the United States, the illness is fatal in about one-third of cases, according to the Centers for Disease Control and Prevention.