The number of West Nile virus cases in Massachusetts this year doubled on Friday as public health officials announced two more.

Risk levels for the mosquito-borne virus are high in 28 communities in the state, including Boston, Newton, Framingham and Lowell, according to the Department of Public Health. Scores more are at moderate risk for the virus, which can in serious cases cause swelling in the brain or around the spinal cord.

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The state's first human West Nile case of the year was reported on Tuesday. It's mosquito season again! Here are some things to know about the most common mosquito-borne disease and how to protect yourself.

The newest cases involve a man in his 40s, believed to have contracted the vir

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