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The staphylocoagulases of Staphylococcus intermedius (39 strains from clinical samples from dogs and 1 strain from a pigeon) and Staphylococcus aureus (40 strains from nine different animal species) were compared by using the chromogenic methods of Engels et al. (W. Engels, M. Kemps, and C. P. A. van Boven, J. Clin. Microbiol. 14:496-500, 1981). S. intermedius produced staphylocoagulase which resembled that of S. aureus in its rate and method of action on prothrombin, but S. intermedius produced it in lesser amounts. Therefore, chromogenic substrate tests such as Chromozym-TH (Boehringer GmbH, Mannheim, Federal Republic of Germany) (as described by Engels et al.) can be used for the detection of staphylocoagulase in both of these species. However, to detect accurately the presence of S. intermedius staphylocoagulase by this method, preconcentration of the extracellular proteins or an extension of the reaction time of the test would be required. The method described by Engels et al. was designed specifically for clinical laboratories that handle human samples. Under those circumstances the method could be regarded as specific, enabling an identification of S. aureus only. However, as both S. aureus and S. intermedius give positive results in this test, in veterinary diagnostic laboratories, heavy reliance must not be placed on this test for determination of organisms to the species level.

Comparison of the staphylocoagulase activities of Staphylococcus aureus and Staphylococcus intermedius on Chromozym-TH