| Streptococcus lactarius |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Bacillota (Firmicutes), Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus
lactarius Martin et al. 2011.
lactarius Martin et al. 2011.
Gram-positive cocci, 1.0-1.3 μm in diameter, occurring as pairs or short chains.
Nonmotile. Nonsporing.
Nonmotile. Nonsporing.
Colonies on Columbia sheep or horse-blood agar plates after 2 days of incubation
are about 0.3–0.5 mm in diameter, circular, flat, greyish, nonpigmented and alpha-
haemolytic. Facultatively anaerobic, grows better under anaerobic conditions. Under
anaerobic conditions, haemolysis is visible only when the plates have been taken out
of the anaerobic chamber for more than 1 hour.
are about 0.3–0.5 mm in diameter, circular, flat, greyish, nonpigmented and alpha-
haemolytic. Facultatively anaerobic, grows better under anaerobic conditions. Under
anaerobic conditions, haemolysis is visible only when the plates have been taken out
of the anaerobic chamber for more than 1 hour.
Isolated from breast milk samples collected from three healthy women. Resistant to optochin.
Undetermined.
- Virginia Martin, Rosario Manes-Lazaro, Juan Miguel Rodriguez, and Antonio Maldonado-Barragan. Streptococcus lactarius sp.
nov., isolated from breast milk of healthy women. Int J Syst Evol Microbiol May 2011 61:1048-1052.
Positive results for arginine dihydrolase, alkaline phosphatase, alanine phenylalanine
proline arylamidase, aesculin hydrolysis, beta-glucosidase, glycyl tryptophan
arylamidase, hippurate hydrolysis, acid production from: lactose, maltose and sucrose.
Negative results for beta-glucuronidase, alpha-galactosidase, pyrrolidonyl arylamidase, N-acetyl-beta-glucosaminidase and beta-
mannosidase, Voges–Proskauer reaction, acid production from: L-arabinose, D-arabitol, cyclodextrin, glycogen, methyl beta-D-
glucopyranoside, mannitol, melibiose, melezitose, pullulan, raffinose, ribose, sorbitol, tagatose and trehalose.
Variable results for beta-galactosidase.
proline arylamidase, aesculin hydrolysis, beta-glucosidase, glycyl tryptophan
arylamidase, hippurate hydrolysis, acid production from: lactose, maltose and sucrose.
Negative results for beta-glucuronidase, alpha-galactosidase, pyrrolidonyl arylamidase, N-acetyl-beta-glucosaminidase and beta-
mannosidase, Voges–Proskauer reaction, acid production from: L-arabinose, D-arabitol, cyclodextrin, glycogen, methyl beta-D-
glucopyranoside, mannitol, melibiose, melezitose, pullulan, raffinose, ribose, sorbitol, tagatose and trehalose.
Variable results for beta-galactosidase.
(c) Costin Stoica
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