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Updated: Jul 6, 2026

Purification of a High Molecular Mass Protein in Streptococcus mutans
Published on: September 14, 2019
New serotype of mutans streptococci isolated from pig oral cavity
Kazuko Takada1, Mitsuhiko Igarashi, Yasutaka Yamaguchi
1Department of Microbiology and Immunology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba, Japan.
Abstract:
Gram-positive streptococcal mutans-like strains, but with clearly different colony formation than S. orisuis on Mitis Salivarius agar, were isolated from the pig oral cavity and identified by 16S rRNA sequencing, G+C content, DNA-DNA homology and extensive biochemical and serological testing. The phenotypic data showed that the strains were similar to S. orisuis except for susceptibility to bacitracin. DNA-DNA homology between the isolates and S. orisuis was 72~81%. However, serological data showed that they have a different sero-specific antigen from S. orisuis and other mutans streptococci. A new serotype, designated p, strains are classified in a serovar of S. orisuis, one of mutans streptococci.
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