hey green color, MRSA colonization in the nose is actually quite common. MRSA is tough to treat is someone ends up in a situation where a wound is infected or something. usually other health problems or immune issues are present when that happens. the reason they test everybody who admits is so they can keep track of it. also they will not put someone who has had recent surgery in your room. (this was something I had to explain often as a nurse).
focus on the sober thing. the nose thing is not worth worrying about.