Both Philadelphia patients had developed a serious neurological condition, a rare side effect of the virus that occurs in less than 1% of patients.
A Culex pipien mosquito specimen, the type of mosquito that carries the West Nile virus, in the insect collection at the Field Museum in Chicago. Philadelphia recently reported its first cases of West Nile in humans in 2024.The cases are the first to be identified this season in Philadelphia, according to an alert sent to health-care providers.
In Pennsylvania, cases of West Nile in humans have also been reported this summer in Allegheny, Bucks, Butler, Lancaster, and, which causes sudden weakness in the arms and legs and a loss of muscle tone and reflexes. The health department’s alert did not provide any further detail on their condition.
But most West Nile patients who show symptoms will instead develop milder symptoms like a fever, headaches, joint pains, and vomiting, although the CDC warns that fatigue from even milder cases can last months. Preventing West Nile infections requires controlling mosquitos in an area, and city health officials regularly spray for mosquitos and destroy the places where mosquitos breed: in standing water, overgrown bushes, and tall grass.
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