Grouping of beta-haemolytic streptococci by agglutination.

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Abstract
Streptococcal grouping sera, diluted and absorbed to remove cross-reactions, were bound to staphylococci and used to group trypsinized .beta.-hemolytic streptococci by co-agglutination. The results compared well with those obtained using the Phadebact streptococcal grouping kit. The same sera bound to staphylococci without prior dilution and absorption could be used to group enzyme extracts of hemolytic streptococci by slide agglutination, the results again comparing favorably with those of the Phadebact kit.