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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus suis (Elliot 1966) Kilpper-Bälz and
Schleifer 1987.
Lancefield group R, S, T or non-groupable.
Schleifer 1987.
Lancefield group R, S, T or non-groupable.
Gram positive, small ovoid cocci, less than 2 μm in diameter, occur singly, in pairs, or
rarely in short chains. Non-motile.
rarely in short chains. Non-motile.
Alpha-hemolytic on sheep blood agar and many strains are beta-hemolytic on horse
blood agar. Optimal growth at 37.0 °C, no growth at 10 or 45 °C, in 6.5% NaCl or
0.04% tellurite. Some strains are resistant to 40% bile.
blood agar. Optimal growth at 37.0 °C, no growth at 10 or 45 °C, in 6.5% NaCl or
0.04% tellurite. Some strains are resistant to 40% bile.
Isolated mainly from the upper respiratory tract of swine (tonsils, pharynx, nose), rarely from other animals (dogs, cats, birds ).
Isolated from slaughter and pig farm workers.
Isolated from slaughter and pig farm workers.
Pig pathogen (meningitis, bacteremia, septicemia, arthritis, pneumonia, endocarditis, poliserositis, abortus, abscesses) especially
in piglets. May be transmitted to humans from diseased animals (meningitis, septicemia, arthritis, endocarditis, pneumonia,
spondylodiscitis, endophthalmitis, uveitis, peritonitis).
Virulence is variable; may be a normal inhabitant of the upper respiratory tract of swine. Sometimes may be a secondary agent in
respiratory infections produced by other germs.
The mice are susceptible to experimental infection (oral or respiratory) and infected mice can transmit the germ to healthy animals.
in piglets. May be transmitted to humans from diseased animals (meningitis, septicemia, arthritis, endocarditis, pneumonia,
spondylodiscitis, endophthalmitis, uveitis, peritonitis).
Virulence is variable; may be a normal inhabitant of the upper respiratory tract of swine. Sometimes may be a secondary agent in
respiratory infections produced by other germs.
The mice are susceptible to experimental infection (oral or respiratory) and infected mice can transmit the germ to healthy animals.
- J. G.Holt et al., 1994.Bergey’s Manual of Determinative Bacteriology, 9-edition, Williams & Wilkins.
- Killpper-Balz R. & Schleifer K.H.: Streptococcus suis sp. nov., nom. rev. Int. J. Syst. Bacteriol., 1987, 37, 160-162.
- Huang YT, Teng LJ, Ho SW, Hsueh PR.: Streptococcus suis infection. J Microbiol Immunol Infect. 2005 Oct;38(5):306-13.
Acid is produced from D-glucose, sucrose, lactose, maltose, salicin, trehalose, and
inulin. L-ornithine decarboxylase , N-acetylglucosaminidase, alpha-galactosidase,
beta-glucuronidase , leucine arylamidase, hydrolysis of: L-arginine, esculin, salicin,
starch & glycogen are positive
No fermentation of L-arabinose, D-mannitol, D-sorbitol, glycerol, melezitose D-ribose,
L-sorbose, D-turanose & xylitol. No hydrolysis of hippurate; no production of acetoin.
Catalase, acid phosphatase and alkaline phosphatase are negative.
Beta-galactosidase, fermentation of raffinose and melibiose and production of hyaluronidase are variable.
inulin. L-ornithine decarboxylase , N-acetylglucosaminidase, alpha-galactosidase,
beta-glucuronidase , leucine arylamidase, hydrolysis of: L-arginine, esculin, salicin,
starch & glycogen are positive
No fermentation of L-arabinose, D-mannitol, D-sorbitol, glycerol, melezitose D-ribose,
L-sorbose, D-turanose & xylitol. No hydrolysis of hippurate; no production of acetoin.
Catalase, acid phosphatase and alkaline phosphatase are negative.
Beta-galactosidase, fermentation of raffinose and melibiose and production of hyaluronidase are variable.
(c) Costin Stoica
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