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A New Type of Phase Variation in the 103 Race of Shigella Paradysenteriae

From the Department of Bacteriology, University of Oregon Medical School, Portland, Oregon

Abstract

Five antigenically identical strains of Shigella paradysenteriae 103 are described. They differ from most 103 strains in possessing a group antigen indistinguishable from that of the X race. The X antigen was the only antigenic component of one phase of the cultures, and was combined with 103 specific antigen in another phase. The X antigen decreased in quantity over a period of 4 years, being gradually replaced by 103B antigen. Some possible interpretations of this phenomenon and its application to the theories of antigenic structure and classification of the Flexners are discussed.