Abstract
Biochemically inactive, non-motile strains of Escherichia coli of the group formerly known as Alkalescens-Dispar (AD) and of known AD serogroups were analysed for biotype, resistotype, type-1 fimbriation, P fimbriation and haemolysin production. All strains of AD serogroups O1 and O2 examined were P-fimbriate and of closely related bio-resistotypes, suggesting that they may be representatives of two E. coli P-fimbriate clones, members of which have not infrequently been isolated from infected urine.