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SAN DIEGO - Lt. Cmdr. Paul Graf , Naval Medical Center San Diego (NMCSD)'s Division Head of Microbiology, Molecular and Immunodiagnostics poses in front of petri dishes for testing. In November 2013 he and 28 others from around the world were certified as American Board of Medical Microbiology (ABMM) diplomates. (U.S. Navy photo by Mass Communication Specialist 2nd Class Sean P. Lenahan\ RELEASED)

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