All Escherichia coli O antigen test strains were examined by immunoelectrophoresis in homologous O and OK sera. The immunoelectropherograms could be subdivided into few well defined groups according to the movement of the O antigen and of the thermostable polysaccharide K antigen, if present. The outcome of the examination confirmed a previous suggestion that only a limited number of test strains have a special polysaccharide K antigen. The previously indicated relationship between pathogenicity and immunoelectrophoretic pattern was emphasized.
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Ørskov et al. (1973) studied this question.
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