FILE - In this Friday, May 11, 2007 photo, a mosquito is 

FILE - In this Friday, May 11, 2007 photo, a mosquito is sorted according to species and gender before testing for West Nile Virus at the Dallas County mosquito lab in Dallas. Scientists have been working on mathematical models to predict outbreaks for decades and have long factored in the weather. They have known, for example, that temperature and rainfall affect the breeding of mosquitoes that carry malaria, West Nile virus and other dangerous diseases. (AP Photo/LM Otero, File)
Associated Press
FILE - In this Friday, May 11, 2007 photo, a mosquito is sorted according to species and gender before testing for West Nile Virus at the Dallas County mosquito lab in Dallas. Scientists have been working on mathematical models to predict outbreaks for decades and have long factored in the weather. They have known, for example, that temperature and rainfall affect the breeding of mosquitoes that carry malaria, West Nile virus and other dangerous diseases. (AP Photo/LM Otero, File)
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