This undated photo provided... Pictures

This undated photo provided by the Northwest Mosquito Abatement District shows a Culex pipiens, left, the primary mosquito that can transmit West Nile virus to humans, birds and other animals. (AP Photo/courtesy the Northwestern Mosquito Abatement District)
This undated photo provided by the Northwest Mosquito Abatement District shows a Culex pipiens, left, the primary mosquito that can transmit West Nile virus to humans, birds and other animals. (AP Photo/courtesy the Northwestern Mosquito Abatement District)

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