They found it was somewhat susceptible to fosfomycin, but that antibiotic is not approved in the U.S. to treat her type of infection. The resistant bacteria have by now collected all the resistance genes. The woman was isolated so that her superbug would not infect other patients in the hospital. The cause of her death was first publicly reported Thursday in an article in the federal Centers for Disease Control and Prevention publication “Morbidity and Mortality Weekly Report.” The article authors, medical professionals from Washoe County, the University of Nevada, Reno, the Nevada State Public Health Laboratory and the CDC, indicated they believe she contracted the infection during a series of hospital treatments in India. Superbugs are also dangerous because they can transfer circular pieces of DNA called plasmids that contain resistance genes to other bacteria. Antibiotic resistance is becoming an increasing threat in the U.S.