Mutant Superbug Has Been Discovered In The U.S.
At least 2 million people become infected in the U.S. each year with antibiotic-resistant bacteria, according to the CDC. Those infections result in at least 23,000 deaths annually.
The Pennsylvania woman’s case, while not deadly, is the first U.S. discovery in a human of bacteria resistant to colistin, a drug held in reserve to treat serious infections that resist another major class of antibiotics called carbapenems. Bacteria that could resist colistin and carbapenems would be unstoppable, according to The New York Times.
In a study last year, the CDC warned that drug-resistant infections would continue to rise. And while the medical community has been anticipating the strain’s arrival, the troubling part is that “this case seems completely home-grown,” according to Dr. Nasia Safdar, an associate professor of infectious diseases at the University of Wisconsin School of Medicine and Public Health.
Multi-drug-resistant bacteria are found elsewhere in the world, frequently in agriculture. This particular colistin-resistant strain, for instance, was first discovered in people and livestock in China in November 2015. Since then, it has turned up in Europe and Canada. The U.S. Department of Agriculture said Thursday it had detected the bacteria in a single sample of a domestic pig’s intestine.
When it comes to spreading resistant bacteria, “food-producing animals are of particular concern,” the CDC says. “Antibiotics must be used judiciously in humans and animals because both uses contribute to the emergence, persistence, and spread of resistant bacteria.”
The CDC, Defense Department and Pennsylvania Department of Health are working to identify close contacts of the Pennsylvania woman to determine if others have also been exposed to the bacteria. Pennsylvania Gov. Tom Wolf (D) said his administration was taking the discovery “very seriously” and promised to “take necessary actions to prevent mcr-1 from becoming a widespread problem with potentially serious consequences.”