The occurrence of fim, pap, sfa, and afa genes was evaluated in 200 Escherichia coli strains isolated from chickens diagnosed with omphalitis, salpingitis, swollen head syndrome, or chronic respiratory disease. Analysis of the strains by colony hybridization tests demonstrated that 96% of the isolates were fim, 16% were pap, and 6% were sfa. None of the isolates was afa. The fim gene occurred i...