Antigenic structure of Lac+ hybrids selected from Escherichia coli x Shigella flexneri crosses was compared in the cross agglutination and absorption tests. Identity of the hybrids from the recipients of serotype 2a and variant Y was proved, as well as from serotypes 1b and 4b. The latter hybrids were coupled with Shigella flexneri strains 3a, 3b and 3c. The hybrids appeared almost identical with serotype 3c.
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