Colonies of Staphylococcus aureusd.
Staphylococcus is a genus of spherical bacteria that grow in grape-like clusters and are found on the skin and mucous membranes of human beings and other animals. Pathogenic staphylococci are responsible for numerous skin, soft tissue, and bone infections, less often causing sepsis, a cavitating pneumonia , bacterial endocarditis, and enterocolitis. Boils, carbuncles, impetigo, and osteomyelitis are commonly due to staphylococci. Treatment usually requires drainage of pus from abscesses, and antibiotics, although some strains have become highly drug-resistant.