First human West Nile virus case of 2026 reported in Massachusetts

masslive.com

Massachusetts health officials announced the first human case of West Nile virus in the state in 2026 on Thursday, involving a man in his 90s from Middlesex County. Risk levels have been raised to moderate in 70 communities across 11 counties due to the case and continued virus detection in mosquitoes. The illness can cause severe disease, especially in older adults or those with weakened immune systems. So far this year, the virus has been found in 180 mosquito samples in every county except Nantucket. Officials urge residents to use insect repellent, avoid outdoor activity at dusk and dawn, and eliminate standing water.


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