[A new variant, for the USSR, of enteropathogenic escherichia 0151:K--, isolated from acute intestinal diseases under the conditional name "Crimea"].

A study was made of enteropathogenic escherichia "Krym" isolated in the USSR from patients with acute enteric diseases; their antigenic structure was unknown. Also cultures of new serological groups officially recorded as standard test-strains were investigated. By its antigenic structure "Krym" escherichia corresponded to the standard strain of the international set 0151:K--. Along with the H10 antigen described earlier "Krym" escherichia proved to possess H11 antigen; these two serological types of escherichia were revealed in the USSR, i.e. 0151:K--: H10 and 0151:K--: H11. The statement on the presence of a new H50 antigen described in escherichia 880-67 with an antigenic formula of 0151:K--: H50 should be revised due to its complex identity with the 0151: K--: H10 strain. For proper serological identification the conditioned name "Krym" should be replaced by "escherichia of serological group 0151:K--".