Yes it stands for Methicillin-resistant Staphylococcus aureus (MRSA). It's a type of staph infection that is hard to treat. I got and I didn't have surgery and I didn't have a wound. Just started as a boil. The dr's used several types of meds before they found a combo that worked.
You would use it exactly as you would when you're calling on a telephone. If it's an international fax, you have to put in the country code as well as the area code.