Is mrsa a rare strain of bacteria?

MRSA: MRSA is methicillin resistant staph aureus. It is not as rare as it used to be. Due to over utilization of antibiotics, many harmless bugs became smarter and figured how to stay alive despite taking powerful antibiotics. The only way to know you may have it, is to be tested with a swab. If it's positive, the patient needs to be on a different antibiotic such as a sulfur compound. Be careful.

Not rare: It is becoming more common.