U.S. officials have found bacteria resistant to the antibiotic of last resort in a sample from a second pig, increasing concerns about the spread of a newly discovered superbug that initially surfaced in this country in March. The latest report involves an antibiotic-resistant strain of E. coli from a pig intestine, which was detected by scientists at the U.S. Department of Agriculture, a spokeswoman said Monday evening.

The E. coli bacteria carried a gene making it resistant to the antibiotic colistin, the drug used against particularly dangerous types of superbugs that can already withstand many other antibiotics. The sample is still undergoing analysis. The bacteria were detected May 27, nearly …READ MORE