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J Clin Microbiol. 1985 April; 21(4): 524-526

Rapid species identification of group C streptococci isolated from horses.

ABSTRACT

Two commercial systems, the API 20S (Analytab Products, Plainview, N.Y.) and the Rapid Strep (API System S.A., Montalieu-Vercieu, France), were evaluated for ease of use and accuracy in the rapid identification of group C streptococci isolated from horses. A total of 85 Streptococcus isolates were tested, including S. equi (67 isolates), S. zooepidemicus (13 isolates), and S. equisimilis (5 isolates). All S. equi and S. zooepidemicus isolates were correctly identified within 24 h by the Rapid Strep system. Specific grouping sera was necessary to distinguish between S. equisimilis and group G or L strains. The API 20S system did not provide species identification of any of these isolates. An identification of randomly selected isolates to species level was performed by conventional methods and confirmed the identification derived through the Rapid Strep system. Our results indicate that the Rapid Strep system is a valuable aid for species identification of equine isolates of group C streptococci.

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