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This 2006 colorized scanning electron micrograph image made available by the Centers for Disease Control and Prevention shows the O157:H7 strain of the E. coli bacteria. On Wednesday, May 26, 2016, U.S. military officials reported the first U.S. human case of bacteria resistant to an antibiotic used as a last resort drug. The 49-year-old woman has recovered from an infection of E. coli resistant to colistin. But officials fear that if the resistance spreads to other bacteria, the country may soon see germs impervious to all antibiotics. (Janice Carr/CDC via AP)
Photo by: Janice Carr
This 2006 colorized scanning electron micrograph image made available by the Centers for Disease Control and Prevention shows the O157:H7 strain of the E. coli bacteria. On Wednesday, May 26, 2016, U.S. military officials reported the first U.S. human case of bacteria resistant to an antibiotic used as a last resort drug. The 49-year-old woman has recovered from an infection of E. coli resistant to colistin. But officials fear that if the resistance spreads to other bacteria, the country may soon see germs impervious to all antibiotics. (Janice Carr/CDC via AP)

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