Airman 1st Class Stephen Nicer, 96th Aerospace Medicine Squadron public health technician, sifts through previously trapped frozen insects July 20 at Eglin Air Force Base, Fla. Nicer sorts the insects for female mosquitoes. The female mosquito bites humans and mammals because they require a blood meal to reproduce. The mosquito specimens are then packaged, labeled and shipped to Wright Patterson Air Force Base in Ohio, where they are studied and tested for viruses. ( Air Force photo/Ilka Cole)

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