Streptococcus salivarius subsp. thermophilus (common name Streptococcus 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).[citation needed] Streptococcus thermophilus is found in fermented milk products. It is not a probiotic (it does not survive the stomach in healthy humans) and is generally used in the production of yogurt.