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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus infantarius Schlegel et al. 2000
Lancefield group D or non-groupable.
Note: in his work Schlegel et al. proposed 2 subspecies infantarius and coli, but S. infantarius subsp. coli was not validly published because no type strain
was designated . In 2002 Poyart et al. included one strain of Schlegel's subspecies coli in S. lutetiensis. In 2003 Schlegel et al. describe again the
subspecies Streptococcus infantarius subsp. coli and Streptococcus infantarius subsp. infantarius but type strain is erroneously cited.
Lancefield group D or non-groupable.
Note: in his work Schlegel et al. proposed 2 subspecies infantarius and coli, but S. infantarius subsp. coli was not validly published because no type strain
was designated . In 2002 Poyart et al. included one strain of Schlegel's subspecies coli in S. lutetiensis. In 2003 Schlegel et al. describe again the
subspecies Streptococcus infantarius subsp. coli and Streptococcus infantarius subsp. infantarius but type strain is erroneously cited.
Gram-positive cocci, non-motile, non-sporulated, grouped in pairs and short chains.
Colonies on blood agar are circular, 1 mm in diameter after 24 h incubation at 37 °C,
unpigmented and alpha-haemolytic. Growth temperature 37 °C. Facultatively
anaerobic. Growth is enhanced in a 5% CO2 atmosphere. Media: Trypticase soy agar
with 5% horse / sheep blood, Brain heart infusion agar or broth, MRS broth.
unpigmented and alpha-haemolytic. Growth temperature 37 °C. Facultatively
anaerobic. Growth is enhanced in a 5% CO2 atmosphere. Media: Trypticase soy agar
with 5% horse / sheep blood, Brain heart infusion agar or broth, MRS broth.
Isolated from human feces, clinical specimens (blood, urine) & foods. (Rarely encountered)
1 case of endocarditis.
Possible association of S. infantarius with noncolonic digestive cancers.
Possible association of S. infantarius with noncolonic digestive cancers.
- Schlegel L., Grimont F., Collins M.D., Regnault B., Grimont P.A.D. & Bouvet A.: Streptococcus infantarius sp. nov.,
Streptococcus infantarius subsp. infantarius subsp. nov. and Streptococcus infantarius subsp. coli subsp. nov., isolated from
humans and food. Int. J. Syst. Evol. Microbiol., 2000, 50, 1425-1434. - Poyart C., Quesne G. & Trieu-Cuot P.: Taxonomic dissection of the Streptococcus bovis group by analysis of manganese-
dependent superoxide dismutase gene (sodA) sequences: reclassification of 'Streptococcus infantarius subsp. coli' as
Streptococcus lutetiensis sp. nov. and of Streptococcus bovis biotype II.2 as Streptococcus pasteurianus sp. nov. Int. J. Syst.
Evol. Microbiol., 2002, 52, 1247-1255. - Schlegel L., Grimont F., Ageron E., Grimont P.A.D. & Bouvet A.: Reappraisal of the taxonomy of the Streptococcus
bovis/Streptococcus equinus complex and related species: description of Streptococcus gallolyticus subsp. gallolyticus subsp.
nov., S. gallolyticus subsp. macedonicus subsp. nov. and S. gallolyticus subsp. pasteurianus subsp. nov. Int. J. Syst. Evol.
Microbiol., 2003, 53, 631-645. - Corredoira J, Alonso MP, Coira A, Varela J.: Association between Streptococcus infantarius (formerly S. bovis II/1) bacteremia
and noncolonic cancer. J Clin Microbiol. 2008 Apr;46(4):1570.
Acid produced from lactose, maltose & sucrose.
Acid not produced from arabinose, arabitol, cyclodextrine, inulin, D-mannitol,
melezitose, ribose, sorbitol & trehalose.
Voges-Proskauer, leucine aminopeptidase and alanylphenylalanyl-
proline arylamidase positive. Arginine dihydrolase, alkaline phosphatase and
pyrrolidonylarylamidase tests are negative. Urea and hippurate are not hydrolysed.
Aesculin hydrolysis is variable
Acid not produced from arabinose, arabitol, cyclodextrine, inulin, D-mannitol,
melezitose, ribose, sorbitol & trehalose.
Voges-Proskauer, leucine aminopeptidase and alanylphenylalanyl-
proline arylamidase positive. Arginine dihydrolase, alkaline phosphatase and
pyrrolidonylarylamidase tests are negative. Urea and hippurate are not hydrolysed.
Aesculin hydrolysis is variable
(c) Costin Stoica
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