Harris Township officials said that the state Department of Environmental Protection collected a mosquito sample from Blue Spring Park that tested positive for West Nile Virus.
The sample was collected on Sept. 6.
The virus is most often spread by mosquitoes and also is found in birds and horses. Most people who are infected show no symptoms, but some can develop serious neurological illnesses.
Residents should take precautions against mosquito bites, like wearing long sleeves and pants or using insect repellent. Home owners should eliminate any standing water until a hard frost occurs.
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Residents should report dead crows, blue jays, hawks or owls to the county West Nile Virus coordinator at 355-6791. More information is available at www.westnile.state.pa.us.