The Massachusetts Department of Public Health announced four more human cases of the West Nile virus, bringing the total number in the state to seven this year. Officials said all four people were exposed in Middlesex County.
The Department of Health said that Cambridge, Newton, Somerville and Watertown are placed at high risk for mosquito-borne disease.
Concord, Lexington, Lincoln, Sudbury, Waltham, Wyland, Weston and Winchester, which are also in Middlesex County, are now considered medium risk. Ditton, Fall River and Swansea are also of moderate risk in Bristol County.
Last year, there were five human cases of West Nile virus infection in Massachusetts.
The Department of Health says that most people with West Nile virus do not have any symptoms, which may include fever and flu-like illness. People over the age of 50 are at greater risk for serious illness.
Health officials are encouraging residents to take precautions, such as wearing mosquito repellent and wearing long sleeves and long pants when there is standing water drainage outside and around homes where mosquitoes thrive.
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