Staphylococcus cohnii
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Staphylococcaceae, Genus Staphylococcus,
Staphylococcus cohnii subsp. cohnii  Schleifer and Kloos 1975,
Staphylococcus cohnii subsp. urealyticus  Kloos and Wolfshohl 1991 (spelling ‘urealyticum’ corrected by Sneath in 1992).
Gram-positive cocci, 0.5 - 1.2 μm, nonmotile, nonsporing. Occur singly or in pairs.
Facultatively anaerobic,  26-37 ºC. Grow at 15 ºC. Grow better in aerobic conditions.
Grow well in medium containing up to 10% NaCl, poor at 15% NaCl. Grow on media:
Trypticase Soy Agar ± 5% sheep blood, Chapman (selective medium with 75 g/l NaCl
& mannitol).
Subsp. cohnii: colonies are nonpigmented or yellowish, smooth, glistening,
opaque, with entire margins.
Subsp. urealyticus: colonies are raised to convex, smooth, glistening, translucent,
with entire margins and gray or grayish white concentric rings. Colony diameter 5.5–
8.0 mm on P agar. Human isolates are  nonpigmented; isolates from other primates
are pigmented and may have bands of alternating colors.
Isolated from human & other primates’ skin. Resistant to Novobiocin.
Is part of the normal flora of the skin, rarely opportunistic pathogen for humans causing urinary tract infections, wound infections,
endocarditis, arthritis and septicemia. Involved in ‘Chronic Fatigue Syndrome’ in humans together with other staphylococci.
  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. & Kloos W.E.: Isolation and characterization of staphylococci from human skin. Amended descriptions of
    Staphylococcus epidermidis and Staphylococcus saprophyticus and descriptions of three new species: Staphylococcus cohnii,
    Staphylococcus haemolyticus, and Staphylococcus xylosus. International Journal of Systematic Bacteriology, 1975, 25, 50-61.
  3. Kloos W.E. & Wolfshohl J.F.: Staphylococcus cohnii subspecies: Staphylococcus cohnii subsp. cohnii subsp. nov. and
    Staphylococcus cohnii subsp. urealyticum subsp. nov. Int. J. Syst. Bacteriol., 1991, 41, 284-289.
  4. Mastroianni A; Coronado O; Nanetti A; Manfredi R; Chiodo F.: Staphylococcus cohnii: an unusual cause of primary septic arthritis
    in a patient with AIDS. Clin. Infect. Dis. 1996, 23(6):1312-3.
  5. 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.
Coagulase negative. See tables for differential characters.
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Hemolysis
Colony > 5mm
Pigment
Aerobic growth
Anaerobic growth
Nitrates reduction
S. cohnii subsp. cohnii
d
d
-
+
d
-
S. cohnii subsp. urealyticus
d
+
d
+
+
-
Lactose
Trehalose
Mannitol
Xylitol
Fructose
Raffinose
Sucrose
Xylose
Mannose
-
+
d
d
+
-
-
-
d
+
+
d
d
+
-
-
-
+
Urease
Growth on
10% NaCl
Growth on 15%
NaCl
Growth at
15 ºC
Growth at
45 ºC
Oxidase
D-Lactic acid
production
Acetoin
production
-
+
d
+
d
-
-
d
+
+
d
+
d
-
+w
d
Arabinose
Cellobiose
Fucose
Salicin
Galactose
Melezitose
Turanose
Ribose
-
-
-
-
-
-
-
-
-
-
-
-
d
-
-
-
Growth on
(NH
4)2SO4
Coagulase
Clumping factor
Fibrinolysin
DNase
Heat-stable
nuclease
Beta-
glucosidase
d
-
-
x
-
-
-
d
-
-
x
-
-
-
Beta-
galactosidase
Novobiocin
resistance
Beta-
glucuronidase
Catalase
Arginine dihydrolase
Alkaline
phosphatase
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+
-
+
-
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+
+
+
+
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+