Group A Streptococcus (GAS) begins as a mild bacteria infection but can develop into the deadly flesh-eating disease necrotizing fasciitis. Researchers at the Hebrew University of Jerusalem have discovered how this bacterium metamorphoses, opening the door to future possible treatments.
http://www.jpost.com/Health-and-Science/Hebrew-University-researchers-explain-how-innocent-bacteria-can-cause-flesh-eating-disease-338459