Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus hyovaginalis
Devriese et al. 1997.
Ungroupable by Lancefield serological testing.
Gram-positive, nonmotile cocci, grouped in long chains.
Regular, under 0.5 mm in diameter, non-pigmented, translucent colonies. On blood
agar colonies are surrounded by zones of alpha-hemolysis. Growth at 37 ºC. Aerobic,
facultatively anaerobic. Growth is enhanced by incubation in a 5% CO2-supplemented
atmosphere. Grow on: Trypticase soy agar with 5% sheep blood, Brain heart infusion
agar or broth. No growth in the presence of 6.5% NaCl, on bile–esculin agar or on
Isolated from the genital tract of swine (vagina).
- Devriese LA, et al. Streptococcus hyovaginalis sp. nov. and Streptococcus thoraltensis sp. nov., from the genital tract of sows. Int. J.
Syst. Bacteriol. 47: 1073-1077, 1997.
- Robert A. Whiley and Jeremy M. Hardie, 2009. Genus I. Streptococcus Rosenbach 1884, 22AL. In: (Eds.) P.D. Vos, G. Garrity, D.
Jones, N.R. Krieg, W. Ludwig, F.A. Rainey, K.-H. Schleifer, W.B. Whitman. Bergey’s Manual of Systematic Bacteriology, Volume 3:
The Firmicutes, Springer, 655-711.
Some biochemical test were performed on API 20 STREP.
Positive results for alkaline phosphatase, alanine phenylalanine, hippurate hydrolysis, N-acetyl-beta-glucosaminidase, beta-
galactosidase, beta-glucuronidase, leucine arylamidase (weak), proline arylamidase, Voges–Proskauer reaction, acid production
from: cellobiose, D-fructose, galactose, D-glucose, N-acetylglucosamine, lactose, maltose, D-mannose, mannitol, salicin, sucrose,
sorbitol & trehalose.
Negative results for alpha-galactosidase, arginine dihydrolase, catalase, esculin hydrolysis, glycyltryptophan arylamidase, beta-
mannosidase, pyrrolidonyl arylamidase, urease, acid production from: D- or L-arabitol, amygdalin, D- or L-arabinose, dulcitol,
erythritol, D- or L- fucose, gluconate, glycerol, glycogen, beta-gentiobiose, inositol, inulin, 2- or 5-ketogluconate, D-lyxose, methyl
alpha-D-mannoside, methyl alpha-D-glucoside, melibiose, melezitose, D-raffinose, rhamnose, L-sorbose, starch, D-tagatose, D-
turanose, pullulan, xylitol, D- or L-xylose & methyl beta-xyloside.
Variable results for acid production from beta-glucosidase, methyl beta-glucopyranoside & ribose.
(c) Costin Stoica