A third human case of West Nile virus has been confirmed in Allegheny County.

The county health department said a Munhall resident who hasn't recently traveled tested positive for West Nile virus. The health department said the patient hasn't been hospitalized. Citing patient privacy, officials didn't release any other details.

The health department said it will conduct additional surveillance and an investigation in the Munhall and Homestead area next week.

What is West Nile virus?

West Nile virus is spread to people from infected mosquitoes.

Most people infected with West Nile virus don't feel sick, according to the CDC . Only one in five people infected develop symptoms, which include a fever, a headache, body aches, joint pains, vomiting, diarrhea and a rash. The health departm

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