Unusual Antigenic Variation in an Enteric Bacterium

Abstract

Eight sucrose-fermenting cultures isolated from lizards had the antigenic formula IV,XII: d,e,h. From them it was possible to obtain forms having the formulas IV,XII: d; IV,XII e,n,z15. The IV,XII: e,h form occurred spontaneously as a loss variant under the usual conditions of culture. The variants were quite stable and could be used for the production of diagnostic serums.