Newswise — Deadly methicillin-resistant Staphylococcus aureus – MRSA – a bacterium that responds poorly to conventional antibiotic treatment, infects 90,000 Americans per year and causes 19,000 deaths, most in hospital settings. Infections have recently been reported outside of hospital settings at an increasing rate, which has alarmed public health officials. Approximately 14% of MRSA-related illnesses occur in community settings.