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 & 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 & xylitol.
Variable results for hemolysis, caseinase, production of acid from: arbutin, cellobiose, lactose & 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 & D-xylose.
(c) Costin Stoica
Culture media
Biochemical tests
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