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. 1978 May;7(5):463–466. doi: 10.1128/jcm.7.5.463-466.1978

Bacitracin and coagglutination for grouping of beta-hemolytic streptococci.

R A Stoner
PMCID: PMC275020  PMID: 350895

Abstract

Bacitracin may be used for presumptive differentiation of group A from other beta-hemolytic streptococci. Whatever criteria are used for the test, a small number of erroneous results will be obtained. With the 1,161 strains studied in this laboratory, using a zone of 10 mm or greater as indicative of group A was better than using Maxted's original criterion of any zone of inhibition for group A. Co-agglutination is a preferable alternative to bacitracin testing, providing a grouping result as quickly as the bacitracin test but with the advantage of giving a definite grouping result. With the 247 strains studied so far, coagglutination results have correlated exactly with results of conventional grouping by a precipitin method.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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