Streptococcus

**Definition:** 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.

**Tree numbers:** - B03.353.750.737.872 - B03.510.400.800.872 - B03.510.550.737.872