And here I thought you were joking.
MRSA is nasty. It lives on the skin, but can be introduced into the body through breaks in the skin, whether intentional (surgery or injections) or unintentional. It causes all kinds of infections depending on where it is, pneumonia being a particularly nasty one.
Although there are a few antiobiotics that can treat it, the problem in some cases is when it gets into deep tissues such as bone, where antibiotics have a hard time reaching it in adequate concentrations. That is why in many cases the only way to definitively get rid of it is to remove the infected tissue. I hope that isn't the case for this guy.