MRSA is an acronym for Methicillin Resistant Staphylococcus aureus (and is sometimes referred to as MERSA), and it is an antibiotic resistant Superbug bacteria that grows in clusters, multiplies very rapidly and can cause many different kinds of infection, ranging from simple skin infections (boils, furuncles) to septicemia (infection of the bloodstream) and toxic shock syndrome, and is spreading rapidly in the United States and worldwide.
Studies approximate that 30-50 % of the population carry colonies of Staphylococcus aureus on their bodies all of the time. Those most susceptible to becoming sick from it are children, the elderly and others with reduced immune system function from diseases such as diabetes and HIV. MRSA used to be a bacteria that was only found in hospital settings HA-MRSA), but in recent years, MRSA has attacked healthy people who have contracted it within their communities (CA-MRSA). MRSA grows very rapidly in warm, moist areas, and is often seen in athletes and gyms.