Staphylococcus aureus is present in the nose (usually temporarily) of about 30% of healthy adults and on the skin of about 20%.
spherical Gram-positive bacterium, that is immobile (nonmotile, no flagella) and forms grape-like clusters. Staphylococci (genus Staphylococcus) is commonly found on the skin and hair as well as in the noses, throats, genital tracts of people and animals, and includes bacteria that can cause food poisoning and other infections.