Second Human Case of West Nile Virus Identified in Allegheny County

Published on September 04, 2025

Second Human Case of West Nile Virus Identified in Allegheny County

PITTSBURGH – The Allegheny County Health Department (ACHD) has confirmed the second human case of West Nile Virus in the county in 2025. 

The individual was hospitalized after developing symptoms in early August. No further details will be released to protect the patient’s privacy. 

Starting Monday, September 8, ACHD will conduct additional surveillance and an investigation in the area. 

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—especially at dawn and dusk. 

Complaints regarding properties with stagnant water can be reported here.  

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.