The previous 2 responders covered most of the bases with MRSA. However, I recommend looking up the differences between healthcare-associated (h-a) MRSA in hospitals and community-acquired (c-a)MRSA.
Check out reputable sites like Mayo Clinic, WebMD, NIH, CDC, etc. This is the link to CDC's site: http://www.cdc.gov/ncidod/dhqp/ar_mrsa_Enviro_Manage.html#1
MRSA stands for methicillin-resistant staphylococcus aureas. That means it is a staph infection (pimples, impetigo, "boils"). Some particular groups of staph have become resistant (no longer respond) to a certain antibiotic (methicillin). If they don't respond to methicillin, they will usually not respond to a wide variety of other antibiotics, as well. Just like there are lots of different types of people, there are different strains of staph. So, one strain of MRSA is not necessarily the same as another MRSA.
Everyone who has MRSA, has staph, but not everyone who has staph has MRSA. Nowadays though, staph infections are assumed to be MRSA until proven otherwise.
The discovery of MRSA over 20 years ago triggered the official worldwide declarations that antibiotics were being abused and overused. Prior to that, doctors might know that antibiotics would not treat a virus, but patients or we moms would insist on prescriptions for our little ones. After all, "what harm would antibiotics do if the kid had a virus and not a bacterial infection?" MRSA is an example of the harm.
MRSA was known to affect patients who were already weakened by other problems. MRSA seemed to only be associated with hospitals until about 10 years ago. Then, new MRSA infections started showing up outside of hospitals in people who had no possible exposure to hospital MRSA. Luckily, these community-acquired MRSA infections aren't usually quite as multi-antibiotic-resistant and/or deadly as hospital-acquired. Some are more aggressive than others, so they all have to be treated aggressively.
After several months of hospitalization for other problems, my aunt died of ha-MRSA pneumonia 20 years ago, in 1989.
Good luck, and thank God you caught it early!