Third Human Case of West Nile Virus Identified in Allegheny County
Published on September 18, 2025
Third Human Case of West Nile Virus Identified in Allegheny County
PITTSBURGH – The Allegheny County Health Department (ACHD) has confirmed the third human case of West Nile Virus in the county in 2025.
The individual resides in the Munhall area. They have not been hospitalized and did not report any recent travel outside of Allegheny County before they became ill. No further details will be released to protect the patient’s privacy.
ACHD will conduct additional surveillance and an investigation in the Munhall and Homestead area during the week of September 22.
“Mosquitoes that carry West Nile Virus are most active from dusk to dawn,” said Nicholas Baldauf, ACHD Vector Control Specialist. “We encourage residents to wear insect repellent or long sleeves and pants when outdoors, especially during these times.”
West Nile Virus is a vector-borne disease spread by mosquitoes. According to the CDC, 70–80% of people infected with West Nile Virus do not develop symptoms. About 20% may experience fever, headache, body aches, joint pain, vomiting, diarrhea, or rash. Most people recover without medical treatment, but less than 1% develop severe neurological illness. Anyone experiencing symptoms should contact a healthcare provider.
ACHD urges residents to protect against mosquito bites by removing standing water, using window and door screens, and applying insect repellent to exposed skin.
“Allegheny County residents play an important role when it comes to reducing the area’s mosquito population,” said Baldauf.
Mosquitoes can breed in as little as half an inch of stagnant water, often found in items such as tires, buckets, clogged gutters, unused swimming pools, and corrugated piping.
To report mosquito breeding sites, residents can contact the ACHD Housing and Community Environment Program at 412-350-4046 or submit a complaint online.
Learn more about Vector-Borne Diseases in Allegheny County.
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The Allegheny County Health Department's mission is to protect, promote, and preserve the health and well-being of the more than 1.2 million people who call Allegheny County home.
Media inquiries may be directed to Ronnie Das,
Public Information Officer for the Health Department,
at ronnie.das@alleghenycounty.us or by phone at 412-578-7991.