Streptococcus thermophilus (S. thermophilus)

Streptococcus thermophilus is a gram-positive, non-motile, non-spore-forming lactic acid bacterium belonging to the viridans group streptococci[1][2]. It is a facultative anaerobe commonly used as a starter culture in the production of yogurt and cheese due to its ability to rapidly ferment lactose into lactic acid and contribute desirable texture and flavor characteristics through exopolysaccharide synthesis[4]. S. thermophilus also produces beneficial molecules such as folic acid and formic acid that support other bacteria during fermentation processes. As a probiotic organism found naturally in the human gastrointestinal tract, it aids digestion by breaking down proteins like casein and helps people with lactose intolerance digest dairy products more easily[3]. Unlike some pathogenic relatives within the Streptococcus genus, S. thermophilus lacks virulence factors associated with disease; it does not adhere strongly to mucosal surfaces nor carry significant antibiotic resistance genes or mobile genetic elements linked to pathogenicity[4]. While widely regarded as safe for use in food products and supplements—even during pregnancy—there are rare reports of adverse events such as sepsis among highly vulnerable populations including immunocompromised individuals or premature infants[1][2][5]. There are no known drugs that specifically target this species nor established biomarkers for patient selection related to its use. S. thermophilus is not considered a therapeutic target like an enzyme or receptor but rather an industrially important microorganism used primarily for its probiotic properties and role in food biotechnology. ---

Other names

Streptococcus salivarius subsp. thermophilusS. thermophilus