Massachusetts and nearby states are facing a serious outbreak of Eastern equine encephalitis (EEE), a deadly mosquito-borne virus. The state's first human case since 2020 was confirmed in Worcester County, and officials have raised the risk level in multiple communities. In response, towns like Plymouth have closed parks and fields from dusk to dawn and imposed curfews to limit outdoor activities. The virus, which carries a high fatality rate, has also been detected in animals, including horses and deer, adding to the concern. Health officials urge residents to take precautions such as using mosquito repellent, wearing long clothing, and avoiding outdoor activities during peak mosquito hours. No treatments or vaccines are available, making prevention critical.