Massachusetts has confirmed its first human case of EEE since 2013. What is the mosquito-borne disease?

(CNN)A man in Massachusetts has been infected with a mosquito-borne virus called Eastern equine encephalitis (EEE), health officials confirmed Saturday. It’s the first human case reported in the state since 2013. Any virus transmitted from an insect bite is a big deal, but what is EEE, and what risk does it pose? EEE is rare but often fatal The virus isn’t common, but it is serious. Seven cases are reported every year on average, but about 30% of all cases are fatal, according to the Centers for Disease Control and Prevention. EEE causes inflammation of the brain, which is often preceded by a high fever, chills and vomiting. As the illness progresses, patients might experience seizures or a coma that …