[Taylor]

As Eugenia alluded to, MRSA is basically a human-developed problem. By having had a medical culture in which GPs basically treat everything with antibiotics, we've got bugs that developed immunities. Thankfully, that mindset is leaving the medical community as doctors (and patients) are becoming more informed of the situation. Which also explains why doctors are hesitant to treat MRSA chemically - who's to say when the next mutant strain will arise that will beat the best antibiotics we've got.
Sometimes, the "old wives' meds" of chicken soup, lots of fluids, vitamins C and E, and lots of rest make the best medicine. All too often patients come to doctors demanding antibiotics, making superbugs.

(superbug, superbug, does whatever a superbug does)