MRSA is transmitted by having direct contact with someone who has an active infection, someone who is a carrier of the infection, or a contaminated object. Methicillin-resistant Staphylococcus aureus (or MRSA for short) is a strain of bacteria resistant to certain types of antibiotics.It is a less common, but potentially more serious, form of the common staph infection.t is estimated that up to 7 percent of people in hospitals and up to 2 percent of people in the community are carriers of the MRSA infection. Methicillin-resistant Staphylococcus aureus (or MRSA for short) is a strain of bacteria resistant to certain types of antibiotics.