Abstract
Summary
1. Encapsulated cultures of Shigella types are described, apparently for the first time. 2. An encapsulated culture of Shigella boydii 2 is described. The occurrence of the same K antigen in other non-encapsulated S. boydii 2 cultures is reported. An encapsulated culture of Shigella boydii 1 also is mentioned. The capsular antigens of S. boydii 1 and S. boydii 2 are not related. 3. The antigenic relationship of the capsular antigen of S. boydii 2 and the capsular antigens of Klebsiella types 11 and 21 is reported. This relationship was demonstrated by both agglutination and quellung reactions. No relationship was found between the K antigen of S. boydii 2 and any of the 59 K antigens of the Escherichia coli group.
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