Public health tests base mosquitoes, results negative for West Nile virus
Dead mosquitoes sit on a paper plate at Ellsworth Air Force Base, S.D., Aug. 9, 2018. The 28th Medical Group public health flight sent more than 700 mosquitoes to the U.S. Air Force School of Aerospace Medicine at Wright-Patterson AFB, Ohio, to test for diseases. (U.S. Air Force photo by Airman 1st Class Thomas Karol)