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In this Aug. 16, 2012, file photo, mosquitos are sorted at the Dallas County mosquito lab in Dallas. Infectious diseases that used to be unknown in Oklahoma are now a threat to the health of its residents as maladies such as the West Nile virus, chikungunya virus and Heartland virus spread around the globe. (AP Photo/LM Otero, File)

In this Aug. 16, 2012, file photo, mosquitos are sorted at the Dallas County mosquito lab in Dallas. Infectious diseases that used to be unknown in Oklahoma are now a threat to the health of its residents as maladies such as the West Nile virus, chikungunya virus and Heartland virus spread around the globe. (AP Photo/LM Otero, File)

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