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Streptococcus thermophilus SD5207 is a strain of Streptococcus thermophilus. This is confirmed by the USP-NF abstract which specifically identifies Streptococcus thermophilus St-21 (ATCC SD-5207) as a pure, specific strain of Streptococcus thermophilus. It is noted for being a non-d-lactate producer strain
Streptococcus thermophilus strains, including SD5207, have evolved mainly via gene horizontal transfer and natural competition in milk environments. This evolution has led to the degradation and disappearance of some carbohydrate metabolism genes, virulence genes, and other genes, making them well-adapted to the stable milk envi…