Identification of streptococcal groups A,B,C, and G by slide co-agglutination of antibody-sensitized protein A-containing staphylococci

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Abstract
Of group A, B, C and G streptococci isolated from various sources, 98.7% were correctly identified by co-agglutination. The active components in this technique are protein A-containing staphylococci coated with antibodies specific for group A, B, C and G streptococci. A suspension of streptococci belonging to 1 of these 4 groups co-agglutinates with the antibody-sensitized staphylococci specific for this group. The technique is extremely rapid and simple and requires no special equipment. It should therefore be a valuable alternative to other techniques used in the grouping of streptococci and is as reliable as the Lancefield technique.