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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus agalactiae Lehmann and Neumann
1896. Synonym Streptococcus difficilis (corrig. Eldar et al. 1995) Kawamura et al. 2005.
Old synonyms: Streptoccocus de la mammite Nocard & Mollereau 1887, Streptococcus agalactiae contagiosae Kitt 1893,
Streptococcus mastitidis Migula 1900.
Lancefield group B.
1896. Synonym Streptococcus difficilis (corrig. Eldar et al. 1995) Kawamura et al. 2005.
Old synonyms: Streptoccocus de la mammite Nocard & Mollereau 1887, Streptococcus agalactiae contagiosae Kitt 1893,
Streptococcus mastitidis Migula 1900.
Lancefield group B.
Gram positive 0.6 - 1.2 μm cocci, non-motile, grouped in long chains.
Beta - hemolytic colonies (although some bovine and fish isolates were not
hemolytic). Growth at 37.0°C, no growth at 45 °C; variable at 10 °C.
Aerobic, facultatively anaerobic. Growth on complex media:
Trypticase soy agar with defibrinated sheep blood. Brain-hearth infusion broth.
hemolytic). Growth at 37.0°C, no growth at 45 °C; variable at 10 °C.
Aerobic, facultatively anaerobic. Growth on complex media:
Trypticase soy agar with defibrinated sheep blood. Brain-hearth infusion broth.
Isolated from human (urogenital tract, intestine) & animal sources (bovine, cats, dogs, rats, hamsters and also from frogs and fish).
Meningitis, septicaemia, arthritis, urinary infections & neonatal sepsis in humans. Usually is a member of the normal flora of the
female urogenital tract and rectum.
Bovine mastitis. Meningitis in fish (Tilapia sp. & Oncorhynchus mykiss). Some endocarditis & dermatitis in dogs reported.
female urogenital tract and rectum.
Bovine mastitis. Meningitis in fish (Tilapia sp. & Oncorhynchus mykiss). Some endocarditis & dermatitis in dogs reported.
- Bergey’s Manual of Determinative Bacteriology, 9th ed., 1994.
- Facklam R (October 2002). "What happened to the streptococci: overview of taxonomic and nomenclature changes". Clin.
Microbiol. Rev. 15 (4): 613–30. - Lehmann K.B. & Neumann R.: Atlas und Grundriss der Bakteriologie und Lehrbuch der speziellen bakteriologischen
Diagnostik, 1st ed., J.F. Lehmann, München, 1896. - Kawamura Y., Itoh Y., Mishima N., Ohkusu K., Kasai H. & Ezaki T.: High genetic similarity of Streptococcus agalactiae and
Streptococcus difficilis: S. difficilis Eldar et al. 1995 is a later synonym of S. agalactiae Lehmann and Neumann 1896
(Approved Lists 1980). Int. J. Syst. Evol. Microbiol., 2005, 55, 961-965.
Esculin, gelatin & starch hydrolysis, pyrrolidonyl arylamidase, acidification of
arabinose, inulin, mannitol, raffinose, sorbitol & xylose - negative.
ADH, VP, alkaline phosphatase, acidification of glucose, glycerol (aerobically),
maltose, ribose (weak) and saccharose, hydrolysis of hippurate -positive.
arabinose, inulin, mannitol, raffinose, sorbitol & xylose - negative.
ADH, VP, alkaline phosphatase, acidification of glucose, glycerol (aerobically),
maltose, ribose (weak) and saccharose, hydrolysis of hippurate -positive.
(c) Costin Stoica
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