Yes, bubonic plague—the Black Death that killed millions in the Middle Ages— is still out there. It even infects and kills people in the United States. Without treatment, half the people infected die, but the Food and Drug Administration approved ciprofloxacin in 2015 to treat plague, and it has just successfully been used to stop the infection in five people.

Before ciprofloxacin was approved for use, people infected with Yersinia pestis, the plague-causing bacteria, were treated with streptomycin or doxycycline. Streptomycin kills the bacteria, but has serious side effects, and doxycycline… more

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