Summary. Antigenic relationships among type-1 fimbriae of 40 strains of Enterobacteriaceae representing 19 species and seven genera were determined by immunoelectronmicroscopy. Ten distinct antigenic groups were distinguished. Intra-and inter-generic relationships were observed although some antigenic groups were species-specific only. Antigenic relationships among type-1 fimbriae are more complex than have been reported hitherto.
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