Research biologist David Dohm, left, and research entomologist Major Monica O'Guinn, work with Aedes japonicus mosquitos, an Asian mosquito species relatively new to the United States, in a Bio Safety Level 3 lab at the U.S. Army Medical Research Institute of Infectious Diseases at Fort Detrick in Frederick, Md., Aug. 24, 2000. In a sealed laboratory, scrub-suited Army scientists are probing the mysteries of mosquitoes that spread the West Nile virus, including one that could be especially adept at transmitting the sometimes deadly disease. (AP Photo/Bill Ryan)