Streptococcus thermophilus

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Streptococcus thermophilus
Scientific classification
Kingdom: Bacteria
Phylum: Firmicutes
Class: Cocci
Order: Lactobacillales
Family: Streptococcaceae
Genus: Streptococcus
Species: S. salivarius
Subspecies: S. salivarius subsp. thermophilus
Binomial name
Streptococcus salivarius subsp. thermophilus
(ex Orla-Jensen 1919)
Schleifer et al. 1995

Streptococcus thermophilus (official name Streptococcus salivarius subsp. thermophilus) is a Gram-positive facultative anaerobe. It is a cytochrome-, oxidase- and catalase-negative organism that is nonmotile, non-spore forming and homofermentative. Streptococcus thermophilus is an alpha-hemolytic species of the viridans group. It is also classified as a lactic acid bacterium (LAB). Streptococcus thermophilus is found in milk and milk products. It is not a probiotic (it does not survive the stomach) and generally used in the production of yogurt.

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