A deadly superbug resistant to all forms of antibiotics has arrived in the U.S. which researchers say may signal the “end of the road” for all antibiotics in the future. Researchers detected the superbug in a 49-year-old Pennsylvania woman who tested positive for carrying the deadly bacteria. Washingtonpost.com reports: Defense Department researchers determined that she carried a strain of E. coli resistant to the antibiotic colistin, according to a study published Thursday in Antimicrobial Agents and Chemotherapy, a publication of the American Society for Microbiology. The authors wrote that the discovery “heralds the emergence of a truly pan-drug resistant bacteria.” Colistin is the antibiotic of last resort for particularly dangerous types of superbugs, including a family of bacteria known as carbapenem-resistant Enterobacteriaceae, or CRE, which health officials have dubbed “nightmare bacteria.” In some instances, these superbugs kill up to 50 percent of patients who become infected. The Centers for Disease Control and Prevention has called CRE among the country’s most urgent public health threats. Health officials said the case in Pennsylvania, by itself, is not cause for panic. The strain found in the woman is treatable with some other antibiotics. But researchers worry that the antibiotic-resistant gene found in the bacteria, [...]