Streptococcus constellatus
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General information
the following information is not yet verified
Taxonomy
Family: Streptococcaceae
Streptococcus anginosus group / “S. milleri” / Lancefield Group F
- S. anginosus
- S. constellatus
- S. intermedius
Natural habitats
They are regarded generally as harmless commensals of the oropharyngeal, urogenital and gastrointestinal microbiota.
Clinical significance
These organisms are strongly associated with abscess formation in the brain, the oropharynx, or the peritoneal cavity.
Specific isolation site
- S. anginosus - urogenital or gastrointestinal tract
- S. constellatus - respiratory tract
- S. intermedius - abscesses of the brain or liver
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Gram stain
the following information is not yet verified
Gram positive streptococci,
grouped in chains
Liquid medium,
they are found in the form of chains of different lengths.
They namely divide into one direction
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Culture characteristics
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the following information is not yet verified
Facultative anaerobic
5% CO2 improves the growth
They are small-colony-forming bacteria (< 0.5 mm), that can display variable patterns of hemolysis (α-, β-, or γ-hemolysis)
Colonies are 0.5-2.0 mm, white, translucent, convex, and entire, some strains produce colonies that are 0.5-1.0 mm, white and matte.
McConkey no growth
BBAØ growth (better)
Odor butterscotch or caramel
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the following information is not yet verified
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Characteristics
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References
Microbiology on the go. An initiative by
Dept. Medical Microbiology and Infectious diseases