The haemagglutinins and fimbriae produced by 18 strains of were studied and compared with those formed by representative strains of other species of Proteeae. After repeated subcultures at 30°C, 12 strains formed only MR/K haemagglutinins which were associated with thin, non-channelled, type-3 fimbriae. Two strains formed simultaneously both MS and MR/K haemagglutinins associated with thick, channelled, type-1 fimbriae and type-3 fimbriae, respectively. Four strains formed simultaneously both MR/K and MR/P haemagglutinins. No strain formed either MS or MR/P haemagglutinins alone under these conditions. The type-3 fimbriae from strain E180 were isolated, purified and found to be protein of 19 Kda. Immunoelectronmicroscopy studies with antibody to the type-3 fimbriae of strain E180 showed that strains formed at least two antigenic types of type-3 fimbriae. The type-3 fimbrial antigen of the vaccine strain E180 was shared by another eight strains of A further eight strains and the strains representative of other genera within Proteeae had type-3 fimbriae of a different antigenic type. The formation of these haemagglutinins and fimbriae suggests that this organism is well endowed to be a urinary-tract pathogen.


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