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.
- 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