[Immunogenicity of isocomponents of the alpha-toxoid of Cl. oedematiens for mice of opposite reacting genotypes].

There was revealed molecular heterogeneity of the highly purified Cl. oedematiens alpha-toxoid. By the method of isoelectrical focussing alpha-toxoid was divided into isocomponents with the isoelectrical points of 5.33 +/- 0.02 and 4.91 +/- 0.08 with an equal specific activity and serological specificity. In studying the immunogenicity of alpha-toxoid and its isocomponents in experiments on mice of oppositely reacting genotypes it was shown that for mice of the low reacting strain (DBA/2) the the alpha-toxoid isocomponents possessed a much greater immunogenicity than the highly purified alpha-toxoid; under the same conditions the immunogenicity of the alpha-toxoid isocomponents for mice of the highly reacting strain (CBA) failed to differ from the immunogenicity of the highly purified alpha-toxoid.