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A genus of gram-positive, coccoid bacteria whose organisms occur in pairs or chains. No endospores are produced. Many species exist as commensals or parasites on man or animals with some being highly pathogenic. A few species are saprophytes and occur in the natural environment.

Micrococci linked together.

A genus of Bacteria comprising spherical or ovoid cells, arranged in rows especially in wreath-forms. S. antitoxin, see Antitoxin. S. enteritis, a kind of enteritis due to infection with S.; occurring in acute forms resembling cholera and in chronic forms like typhoid fever.

A member of the Schizomycetes, of the family Coccaceae and the genus Streptococcus. Its individual members divide in one plane and its special characteristic is the formation of long chains of cocci.