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Streptococcus thermophilus formerly known as Streptococcus salivarius subsp. thermophilus [2] [1] is a gram-positive bacterium, and a fermentative facultative anaerobe, of the viridans group. [3] It tests negative for cytochrome , oxidase , and catalase , and positive for alpha-hemolytic activity. [ 3 ]
Streptococcus salivarius is a species of spherical, gram-positive, facultative anaerobic lactic acid bacteria [1] that is both catalase and oxidase negative. S. salivarius colonizes (usually in chains) the oral cavity and upper respiratory tract of humans just a few hours after birth, making further exposure to the bacteria harmless in most circumstances.
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Main Streptococcus groups are included as "Strep." at bottom left. In clinical practice, the most common groups of Streptococcus can be distinguished by simple bench tests, such as the PYR test for group A streptococcus. There are also latex agglutination kits which can distinguish each of the main groups seen in clinical practice.
Lactobacillus delbrueckii subsp. bulgaricus is commonly used alongside Streptococcus thermophilus [8] as a starter for making yogurt. The Lb. bulgaricus 2038 strain has been used for decades for yogurt fermentation. The two species work in synergy, with L. d. bulgaricus producing amino acids from milk proteins, which are then used by S ...
Lactobacillus salivarius [18] Lactococcus lactis [9] Streptococcus salivarius subsp. thermophilus [14] [15] [17] References
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The Streptococcus anginosus group (SAG), also known as the anginosus group streptococci (AGS) or the milleri group streptococci (MGS), are a group of several species of streptococci with clinical similarities. The group is named after a principal member species, Streptococcus anginosus.