Staphylococcus aureus micrograph
Gram stain of a smear from culture.
Result: Gram-positive cocci in clusters (from the Greek staphyle, bunch of grapes).
Compare morphology and arrangement of Staphylococcus spp., Streptococcus spp., Enterococcus spp. and Micrococcus spp. (here).
Staphylococci have a typical Gram-positive cell wall structure and like all medically important cocci are nonflagellate, nonmotile, and non-spore forming.