Airman 1st Class Karen Diaz-Zavala, 82nd Medical Support Squadron clinical laboratory technician, analyzes a quality control sample of Shigella, a gastro-intestinal disease causing bacteria at Sheppard Air Force Base, Texas, Sept. 5, 2019. Performing quality control ensures that laboratory tests are accurate and that medical providers have the most reliable information to treat their patients. (U.S. Air Force photo by Senior Airman Ilyana A. Escalona)

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Photo by: Senior Airman Ilyana A. Escalona |  VIRIN: 190905-F-NN403-1012.JPG