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Taxonomy: V4.1   |  16S rRNA RefSeq: V16.03   |  Genomic RefSeq: V11.02   |  Viruses: V1.2
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Streptococcus mitis (HMT-677)

Bacteria;Bacillota;Bacilli;Lactobacillales;Streptococcaceae;Streptococcus mitis

Taxon Description: Heterogenous group of viridans type of streptococci that has had taxonomic revisions. Original type strain NCTC 3165 (= SK51) clustered with Streptococcus gordonii strains. Proposed NCTC 12261 be replacement type strain of S. mitis [2]. Closely related to S. pneumoniae by 16S rRNA comparisons.
Classification:
Bracketed letters indicate
that the taxonomic name at this
level has not been established.
  • Examples:
  • C1 – First Unnamed Class
  • O1 – First Unnamed Order
  • F2 – Second Unnamed Family
  • G3 – Third Unnamed Genus
Domain: Bacteria
Phylum: Bacillota
Class: Bacilli
Order: Lactobacillales
Family: Streptococcaceae
Genus: Streptococcus
Species:mitis
Bacterial Name: Streptococcus mitis
Naming Status: Named
Cultivation Status: Cultivated
Body Site (or Source): (in beta) Primary: Oral (Abundance: High)
Reference(s):
    https://doi.org/10.1146/annurev-micro-090817-062503
Type/Reference Strain:
Former Names or Synonyms:
Phylum: Firmicutes
16S rRNA Reference Sequences: RefSeq-ID(s)      [View Taxon in RefSeq Tree ]
HMT-677_16S001725 Show Sequence
HMT-677_16S001728 Show Sequence
HMT-677_16S001730 Show Sequence
HMT-677_16S001731 Show Sequence
HMT-677_16S001742 Show Sequence
HMT-677_16S001765 Show Sequence
HMT-677_16S001771 Show Sequence
HMT-677_16S001774 Show Sequence
HMT-677_16S001780 Show Sequence
HMT-677_16S001797 Show Sequence
HMT-677_16S001826 Show Sequence
HMT-677_16S001830 Show Sequence
HMT-677_16S001845 Show Sequence
HMT-677_16S001850 Show Sequence
HMT-677_16S001856 Show Sequence
HMT-677_16S001862 Show Sequence
HMT-677_16S001874 Show Sequence
HMT-677_16S001894 Show Sequence
HMT-677_16S001897 Show Sequence
HMT-677_16S001898 Show Sequence
HMT-677_16S001913 Show Sequence
HMT-677_16S001914 Show Sequence
HMT-677_16S001921 Show Sequence
HMT-677_16S001922 Show Sequence
HMT-677_16S001930 Show Sequence
HMT-677_16S001934 Show Sequence
HMT-677_16S001974 Show Sequence
HMT-677_16S001988 Show Sequence
HMT-677_16S001989 Show Sequence
HMT-677_16S001990 Show Sequence
HMT-677_16S001994 Show Sequence
HMT-677_16S001998 Show Sequence
HMT-677_16S002002 Show Sequence
HMT-677_16S002009 Show Sequence
HMT-677_16S002015 Show Sequence
HMT-677_16S002036 Show Sequence
HMT-677_16S002047 Show Sequence
HMT-677_16S002066 Show Sequence
HMT-677_16S002079 Show Sequence
HMT-677_16S002081 Show Sequence
HMT-677_16S002092 Show Sequence
HMT-677_16S002097 Show Sequence
HMT-677_16S002099 Show Sequence
HMT-677_16S002102 Show Sequence
HMT-677_16S002111 Show Sequence
HMT-677_16S002114 Show Sequence
HMT-677_16S002124 Show Sequence
HMT-677_16S002130 Show Sequence
HMT-677_16S002151 Show Sequence
HMT-677_16S002156 Show Sequence
HMT-677_16S002159 Show Sequence
HMT-677_16S002176 Show Sequence
HMT-677_16S002184 Show Sequence
HMT-677_16S002197 Show Sequence
HMT-677_16S002199 Show Sequence
HMT-677_16S002201 Show Sequence
HMT-677_16S003513 Show Sequence
HMT-677_16S006461 Show Sequence
HMT-677_16S006523 Show Sequence
HMT-677_16S006592 Show Sequence
HMT-677_16S006593 Show Sequence
HMT-677_16S006595 Show Sequence
HMT-677_16S006665 Show Sequence

Download latest 16S rRNA reference gene sequences.
species/SmitisMagenta-HparaCyan.jpg Cells of Streptococcus mitis/oralis (magenta) and Haemophilus parainfluenzae (cyan) together in dental plaque.
See Perera et al. 2021
Number of
Genome Sequences:		 81 Open Genomes in Table
Pangenome(s): Open Interactive Anvi`o:
Streptococcus__mitis__HMT_677
or View SVG Image
Microbial Ecology: Abundance/Prevalence
Proteomics:
NCBI Taxon ID: 28037 [Link to NCBI]
LPSN.dsmz.de: https://lpsn.dsmz.de/species/Streptococcus-mitis
PubMed Searches:
NCBI PubMed Link
NCBI (Entrez) Nucleotide Link
NCBI (Entrez) Protein Link
Phylogenetic Trees:
Genome Tree
Ribosomal Protein Tree
16S rRNA Gene Tree
Disease Associations: Not usually attributed to disease especially oral infections.May be involved in infective endocarditis toxic shock-like syndrome and neonatal infections. Septicemias have been reported.
Prevalence and Source: Commonly found on most surfaces in the human oral cavity and throat [1].
Phenotypic Characteristics:
Facultatively anaerobic Gram positive cocci approximately 1 um in diameter that grow in short or long chains in broth cultures. Carbohydrates are femented primarily to lactic acid and no gas. Catalase negative. Cell wall contains riitol teichoic acid and minimal rhamnose. Peptidoglycan type is Lys-direct. G+C content is 41 mol%.[23]2 biovars of S. mitis differ biochemically and serologically [23]
Cultivability: Alpha-hemolytic colonies (0.7- 1.2 mm diameter) on blood agar and extensive greening on chocolate agar.
References:
[1] Kilian M, Mikkelsen L, Henrichsen J. Taxonomic study of viridans Streptococci: Description of Streptococcus gordonii sp. nov. and emended descriptions of S. sanguis (White and Niven 1946), S. oralis .... Int J Syst Bacteriol. 1989 Oct;39(4):471-84.
[2] Aas JA, Paster BJ, Stokes LN, Olsen I, Dewhirst FE. Defining the normal bacterial flora of the oral cavity. J Clin Microbiol. 2005 Nov;43(11):5721-32
[3] Hardie RM. Genus Streptococcus. Bergey's Manual of Systematic Bacteriology 1986; Vol. 2, pp. 1043-1063.