Public health tests base mosquitoes, results negative for West Nile virus
A trap is readied to collect mosquito specimen at Ellsworth Air Force Base, S.D., Aug. 13, 2018. Members assigned to the 28th Medical Group public health flight capture mosquitoes on a continuous basis to be sent off and tested for diseases, such as the West Nile virus. (U.S. Air Force photo by Airman 1st Class Thomas Karol)