Why does mrsa harbor in the nose yet it is not resp transmitted?

MRSA: Staphylococcus aureus (in this case methicillin-resistant) is part of our normal bacterial flora. It is not until it gains entry into various areas of our body that it becomes a pathogen. This often occurs with disruption in the skin and mucous membranes. It can, in fact, be respiratorily transmitted under the the proper circumstances. This is a complex subject that cannot be fully addressed here.