Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus porci Vela et
Lancefield group B.
Gram positive cocci, 0.3-0.5 μm in diameter, grouped in short chains (3-8 cells) or
pairs. Nonmotile. Nonspore-forming.
Colonies on blood agar are small, circular and non-pigmented, 0.75-1.0 mm in
diameter and alpha-haemolytic. Facultatively anaerobic. Grow at 37.0 ºC, not at 10 or
45 ºC. Grow at pH 9.6. No growth in 6.5% NaCl media.
Habitat is unknown. The type strain was isolated from the heart of a pig with pericarditis.
Uncertain; may induce pericarditis in pigs.
- A. I. Vela, M. Perez, L. Zamora, L. Palacios, L. Dominguez, and J. F. Fernandez-Garayzabal. Streptococcus porci sp. nov., isolated
from swine sources. Int J Syst Evol Microbiol January 2010 60:104-108.
Description is based on results obtained using API 50CH, API ZYM and Rapid ID32
Strep kits (Biomerieux).
Positive results for beta-galactosidase, alpha-glucosidase, leucine arylamidase, alpha-galactosidase, beta-glucosidase,
alanine-phenylalanine-proline arylamidase, glycyl-tryptophan arylamidase, acid production from: L-arabinose, arbutin,
N-acetylglucosamine, cellobiose, D-fructose, D-glucose, D-galactose, glycogen, D-lactose, maltose, melibiose, D-mannose,
pullulan, raffinose, rhamnose, salicin, starch, sucrose, trehalose & D-xylose.
Negative results for alkaline phosphatase, acid phosphatase, arginine hydrolysis, catalase, hippurate hydrolysis, urea hydrolysis,
Voges-Proskauer reaction, N-acetyl-beta-glucosaminidase, naphthol-AS-BI-phosphohydrolase, alpha-mannosidase,
alpha-fucosidase, esterase C4, esterase lipase C8, lipase C14, valine arylamidase, cystine arylamidase, trypsin,
alpha-chymotrypsin, beta-glucuronidase, beta-mannosidase, pyroglutamic acid arylamidase, acid production from: aesculin,
amygdalin, D-arabinose, D-adonitol, L- or D-arabitol, cyclodextrin, dulcitol, erythritol, D- or L-fucose, gentiobiose, glycerol, inositol,
inulin, 2- or 5-ketogluconate, D-lyxose, D-mannitol, melezitose, methyl alpha-D-mannopyranoside, methyl alpha-D-glucopyranoside,
methyl beta-D-glucopyranoside, D-ribose, sorbitol, L-sorbose, tagatose, turanose, xylitol & L-xylose.
(c) Costin Stoica