staph is very common and smart bacteria.
it learn to resist antibiotic very fast.
many antibiotic are there in market.
but many of them do not work as there is resistant develop by bacteria
so now a day ,it is advisable to do sensitivity test and then take proper medicine
if minor infection is there ,it cover by penicillin group of drug mainly,
if skin infection
is there ,u need to apply mupirocin
cream over it