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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus mitis Andrewes and Horder 1906.
Lancefield group O (biovar 1), K or non-groupable.
Lancefield group O (biovar 1), K or non-groupable.
Gram positive cocci, 0.6-0.8 μm in diameter, arranged in long chains, non-motile.
S-type, sometimes R-type colonies, alpha-haemolytic. Rarely mucoid colonies may
occur or colonies resembling broken glass.
Facultatively anaerobic, growth at 37.0 °C. Growth at 45 °C is variable.
Growth on : trypticase soy agar with defibrinated sheep blood., brain heart infusion
broth. Most strains may require some factors from yeast extract for growth.
occur or colonies resembling broken glass.
Facultatively anaerobic, growth at 37.0 °C. Growth at 45 °C is variable.
Growth on : trypticase soy agar with defibrinated sheep blood., brain heart infusion
broth. Most strains may require some factors from yeast extract for growth.
Isolated from human saliva, sputum & feces.
Oral & pharynx normal inhabitant. May cause septicaemia, endocarditis or meningitis in immunosuppressed organisms.
- Andrewes F.W. & Horder T.J.: A study of the streptococci pathogenic for man. Lancet, 1906, 2, 708-713
- Elliott, John A., Burke, John P., Classen, David C., Ford, Clyde D., Evershed, Sherri, Aloia, Mary R., Wilfahrt, James K.:
Streptococcus mitis sepsis in bone marrow transplant patients receiving oral antimicrobial prophylaxis. American Journal of
Medicine, 1990. - Balkundi, Dhruv R. M.B., B.S., M.R.C.P.; Murray, Dennis L. M.D.; Patterson, Maria J. M.D., Ph.D.; Gera, Renuka M.D.; Scott-
Emuakpor, Ajovi M.D., Ph.D.; Kulkarni, Roshni M.D.: Penicillin-Resistant Streptococcus mitis as a Cause of Septicemia with
Meningitis in Febrile Neutropenic Children
Acid is produced from glucose, lactose, maltose & sucrose. Variable reaction for
trehalose, inulin, raffinose, salicin, sorbitol. Acid is not produced from arabinose,
xylose, glycerol & mannitol.
Voges-Proskauer, catalase, hydrolysis of hippurate, pyrrolidonearylamidase &
beta-glucuronidase negative.
Hydrolysis of esculin, alpha & beta-galactosidase, alkaline phosphatase, ADH
variable.
trehalose, inulin, raffinose, salicin, sorbitol. Acid is not produced from arabinose,
xylose, glycerol & mannitol.
Voges-Proskauer, catalase, hydrolysis of hippurate, pyrrolidonearylamidase &
beta-glucuronidase negative.
Hydrolysis of esculin, alpha & beta-galactosidase, alkaline phosphatase, ADH
variable.
(c) Costin Stoica
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