E. coli bacteria strain found in country for the first time as experts warn more cases should be expected in the future. A 49-year-old woman has become the first person in the US to be infected with a superbug, an alarming new development in the spread of bacteria that cannot be treated by any antibiotics. US health officials said on Thursday a strain of E. coli bacteria resistant to colistin, which is known as a treatment of last resort, was found in a Pennsylvania woman who