Airman Levi Hensley, a laboratory Phase II student at David Grant Air Force Medical Center inspects a petri dish containing a strep throat quality control culture specimen, Oct. 4, 2018, Travis Air Force Base, Calif. While in Phase II training, the students will only handle practice samples. DGMC is the Air Force’s largest medical center in the continental United States and serves military beneficiaries throughout eight western states.

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Photo credit: © David Wa / Alamy / Afripics
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