Air Force Staff Sgt. Renee Delgado, 18th Medical Group lab technician, rinses excess stain from a bacteria sample prior to analysis May 14, 2018, at Kadena Air Base, Japan. Lab technicians test different types of bacteria in small plates. Once the bacteria begin to multiply, it is known as a “culture.”

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Photo credit: © RP Images / Alamy / Afripics
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