Erin Penney, 88th Diagnostics and Therapeutic Squadron microbiology technical supervisor, places slides into the Previ Color gram stainer inside the microbiology laboratory at Wright-Patterson Air Force Base medical center June 30, 2017. This Gram staining processor is more efficient than the rudimentary method of Gram staining bacteria, whereas it allows multiple slides to be stained simultaneously. ( Air Force photo/Michelle Gigante)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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