LANSDOWNE, Pa. (WPVI) -- Health officials in Delaware County are spraying for mosquitoes after detecting several populations carrying West Nile virus.

The Delaware County Health Department collected mosquito samples from areas including Newtown Square, where standing water was found to be teeming with larvae.

"Right where my dipper is, there's something there. That's a mosquito larva, believe it or not," said Zachary Babel of the Delaware County Health Department while inspecting a water dish.

Officials say the virus, which can cause illness in humans, has not yet resulted in any known human cases in the county this year. However, the presence of infected mosquitoes has prompted action.

"There was a certain level of West Nile virus mosquito activity and it posed a risk for human infec

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