The function of the Vi antigen ofSalmonella paratyphiA. Comparison between virulence, agglutinability by anti-O immune sera and sensitivity to the bactericidal actionin vitro

Abstract
Experiments were performed which show that virulent strains ofSalmonella paratyphiA contain an additional antigen which has all the properties of a Vi antigen.The anti-Vi immune serum combined in suitable proportions with an anti-0 immune serum exerted maximal bactericidal effect on virulent strains.

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