Hi and thanks for the query, MRSA is a specific type of bcterial infection caused by a methillcilline Resistant Staphylococcus Aureus. This germ poses problems because it is resistant to the commonly used antibiotics, and might cause serious complications in patients, especially if the infection spreads. I do understand its a real fear after bee sent home, he presents with such staining under armpits. for sure, risk of spreading this infection to other folks in the home is high. I suggest high levels of hygiene, and seeking the opinion of an infectious disease specialist. Culture and sensitivity analysis to detect the appropriate antibiotic that could be used against the germ in this specific case could be the main gateway. I think you should Consult an infectiologist. Kind regards. Bain LE, MD