Explore the recorded discovery and history of Streptococcus mutans, with source links and stated limits.
S. mutans is a member of the oral microbiota and is described in the Frontiers review as the main pathogenic bacterium causing dental caries. It synthesises extracellular polysaccharides through glucosyltransferase, promoting bacterial adhesion and aggregation and leading to the formation of plaque biofilm. Four serotypes are recognised — c, e, f and k — classified by the composition and structure of cell-wall-associated rhamnose polysaccharides, with serotype c predominating at a detection rate of over 70% in the mouths of healthy subjects, serotype e at approximately 20% and serotype k at less than 5%. The same review describes roles beyond the mouth, including strains isolated from infected heart valve tissue in infective endocarditis. Caries itself is multifactorial, involving diet, saliva, fluoride exposure, tooth structure and the whole plaque community, so this organism is one contributor rather than the sole cause.
LPSN records Streptococcus mutans Clarke 1924, effectively published in the British Journal of Experimental Pathology in a paper on the bacterial factor in the aetiology of dental caries, and retained on the 1980 Approved Lists of Bacterial Names. The epithet mutans means changing, referring to the way the organism’s appearance shifts between coccal and rod-like forms. Type strain ATCC 25175 / DSM 20523 / NCTC 10449.
This profile describes a normal member of the oral microbiota. There is no first human case to identify, and dental caries is a multifactorial disease of the tooth rather than an infection traced to an index patient.
Source check: 2026-09-20. Educational content; independent scientific review remains pending.