- Staphylococcus (from the Greek "stafile" - a bunch of grapes and "coccus" - grain, berry), received such a name because of its characteristic form - a cluster resembling grapes of grapes. The most pathogenic effect is the appearance of these bacteria Staphylococcus aureus ("Staphylococcus aureus", since it forms accumulations of golden color), which causes various purulent diseases and food intoxications; - streptococci (from the Greek "streptos" - a chain), the cells of which do not diverge after division, but form a chain. These bacteria are the causative agents of various inflammatory diseases (angina, bronchopneumonia, otitis media, endocarditis and others).