Staphylococcus equorum
Cultural characteristics
Biochemical characters
Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Staphylococcaceae, Genus Staphylococcus,
- Staphylococcus equorum subsp. equorum  Schleifer et al. 1985
- Staphylococcus equorum subsp. linens  Place et al. 2003.
Gram-positive cocci, 0.5-1.8 μm, nonmotile, nonsporing.
Colonies white, opaque, with entire margins, 4-6 mm in dimeter after incubation at
2 days at 37 ºC on brain heart infusion agar (subsp. equorum).
Colonies are white, glossy, and opaque, 1-2 mm in diameter after 2 days on PC
skim milk agar (Merck) at 32 ºC (subsp. linens).
Temperature range for growth 6-40 ºC. Aerobic. Other media: Trypticase Soy Agar ±
5% sheep blood.
Isolated from human & animal skin - horse, cat (subsp. equorum),  fermented sausages, curing brines, raw ham, from swiss cheese
surface (subsp. linens).
Contribute to the development of the meat  and cheese products flavour. Non-pathogenic / unknown pathogenicity.
May inhibit Listeria’s growth.
  1. Holt J.G., Krieg N.R., Sneath P.H.A., Staley J.T., Wiliams S.T., 1994. Bergey's Manual of Determinative Bacteriology, Ninth Edition,
    Williams & Wilkins, Baltimore. Group 17, Gram-Positive Cocci, 527-558.
  2. Schleifer K.H., Killper-Balz R. & Devriese L.A.: Staphylococcus arlettae sp. nov., S. equorum sp. nov. and S. kloosii sp. nov.: three
    new coagulase-negative, novobiocin-resistant species from animals. Syst. Appl. Microbiol., 1985, 5, 501-509.
  3. Place R.B., Hiestand D., Gallmann H.R. & Teuber M.: Staphylococcus equorum subsp. linens, subsp. nov., a starter culture
    component for surface ripened semi-hard cheeses. Syst. Appl. Microbiol., 2003, 26, 30-37.
  4. Karl-Heinz Schleifer and Julia A. Bell, 2009. Family VIII. Staphylococcaceae fam. nov.. 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, 392-426.
Subsp. equorum:
Positive results for catalase, beta-glucuronidase, beta-galactosidase, nitrate reduction, urease, phosphatase, acid production from:
L-arabinose, D-fructose, D-galactose, D-glucose, glycerol, maltose, D-mannose, D-mannitol, D-melezitose, D-ribose, salicin,
sorbitol, sucrose, trehalose and D-xylose. Weak reactions for esculin and tributyrin hydrolysis.
Negative results for coagulase, clumping factor, gelatinase, heat-stable nuclease, oxidase, hyaluronidase, staphylokinase, Tween 80
hydrolysis, fibrinolysin, acetoin production, arginine hydrolysis, acid production from: amygdalin, D-fucose, beta-gentiobiose,
D-melibiose, raffinose, L-rhamnose and xylitol.
Variable results for hemolysis, caseinase, production of acid from: arbutin, cellobiose, lactose and D-turanose.

Subsp. linens:
Positive results for nitrate reduction, urease, acid production from glucose, fructose, D-mannose, and turanose (weak).
Negative results for acetoin production, arginine dihydrolase, ornithine decarboxylase, beta-glucuronidase, beta-galactosidase,
alkaline phosphatase, esculin hydrolysis, hemolysis,  oxidase, acid production from: L-arabinose, cellobiose, D-galactose,
alpha-D-lactose, maltose, mannitol, D-raffinose D-ribose, salicin, sucrose, D-trehalose and D-xylose.
(c) Costin Stoica
Culture media
Biochemical tests
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