Medical experts say staphylococcus aureus, cause of some of the most troublesome infections to afflict man, has become resistant to the antibiotic of last resort, vancomycin. The U.S. Centers for Disease Control announced the first confirmed case of vancomycin-resistant staph aureus -- known in the medical world as VRSA -- found last month in a Michigan man. "The genie is out of the bottle," Dr. Donald Low, microbiologist-in-chief at Mount Sinai Hospital, says of the confirmation. "It's ominous." The experts know the Michigan case is solid proof they will soon have to deal with their nightmare scenario -- common staph...