MRSA stands for methicillin-resistant Staphylococcus aureus. It is sometimes known as a super bug.
There are various subtypes (strains) of S. aureus and some strains are classed as MRSA.
MRSA strains are very similar to any other strain of S.aureus.
That is, some healthy people are carriers and some people develop the types of infections described above.
Most S. aureus infections can be treated with commonly used antibiotics.
However, MRSA infections are resistant to an antibiotic called methicillin and also to many
other types of antibiotics. Resistance means that the bacteria are not killed by the antibiotic.