In a study that appears in the Proceedings of the National Academy of Sciences, scientists have determined the drug-resistant superbugs known as MRSA infections, came from one rapidly evolving bacterium. According to scientists, the bacteria emerged from a single strain, dubbed USA300. The USA300 group of strains appear to have extraordinary transmissibility and fitness and researchers anticipate it will evolve into various strains that will have a wide range of disease-causing potential in the future.

As reported by The World Federation of Building Service Contractors.