In my experience usually Methicillin-Resistant Staph Aureus (MRSA) pops up as a secondary infection in animals due to a suppressed immune system. The only thing that makes MRSA special is its resistance to Methicillin based drugs (e.g. the pencillin family/complexes) that disrupt the single-layer bacterial cell walls. A broad spectrum aminoglycoside like Amerikacin which targets bacterial ribosomes should clear it up. Just focus on maintaining proper husbandry and you should be fine.
And only tube feed as a final measure to prevent death due to starvation.