Tech. Sgt. Elizabeth Ehrnschwender, 99th Medical Support Squadron NCO in charge of microbiology, holds a Petri dish that contains Escherichia coli bacteria April 10, 2013, at Nellis Air Force Base, Nev. E. Coli bacteria is inexpensively and easily grown and studied in a laboratory setting. Most E. coli strains are harmless. Some serotypes can cause serious food poisoning in humans and are occasionally responsible for product recalls due to food contamination. (U.S. Air Force photo by Airman 1st Class Jason Couillard)
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