Streptococcus parasuis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus parasuis
Nomoto et al. 2015.
Gram-positive cocci, 0.5-1 μm in diameter, occurring in pairs or in chains, commonly
over 10 cells long. Non-spore-forming. Non-motile.
Colonies on blood agar at 37 ºC are small, circular and non-pigmented, 0.5-1.0 mm
in diameter and alpha-haemolytic. Can grow at 10, 22, 30, 37 and 42 ºC. Does not
grow in the presence of 6.5 % (w/v) NaCl.
Isolated from the saliva of a clinically healthy pig.
Undetermined.
  1. Nomoto, R., Maruyama, F., Ishida, S., Tohya, M., Sekizaki, T. and Osawa, R. 2015. Reappraisal of the taxonomy of Streptococcus
    suis serotypes 20, 22 and 26: Streptococcus parasuis sp. nov. Int. J. Syst. Evol. Microbiol., 65, 438-443
Description is based mainly on API ZYM and Rapid ID32 Strep results.

Positive results for esterase (C4), esterase lipase (C8), leucine arylamidase, naphthol-AS-BI-phosphohydrolase, acid production
from: trehalose, maltose, pullulan, glycogen & sucrose.

Negative results for acid and alkaline phosphatase, arginine hydrolysis, catalase, cystine arylamidase, alpha-fucosidase,
alpha-galactosidase, alpha- and beta-glucosidase, beta-glucuronidase, N-acetyl-beta-glucosaminidase, glycyl-tryptophan
arylamidase, hippurate hydrolysis, alpha-mannosidase, lipase (C14), beta-mannosidase, pyroglutamic acid arylamidase, trypsin,
alpha-chymotrypsin, urease, valine arylamidase, Voges-Proskauer test, acid production from: L-arabinose, D-arabitol, cyclodextrin,
melibiose,  D-mannitol, melezitose, D-ribose, D-sorbitol & tagatose.

Variable results for beta-galactosidase, acid production from: raffinose & lactose.
(c) Costin Stoica
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