Frequency of the gene combinations within the structure of (A) type 1 and (B) P fimbriae operons among the E. coli isolates from piglets and sows. Note: The gene combinations within the structure of type 1 fimbriae operon: Complete operon: fimB-fimE-fimA-fimI-fimC-fimH; Without 1 gene: fimB-fimE-fimI-fimC-fimH; Without 2 genes: fimB-fimI-fimC-fimH, fimB-fimE-fimC-fimH, fimE-fimI-fimC-fimH; Without 3 genes: fimB-fimC-fimH, fimB-fimA-fimH, fimI-fimC-fimH, fimB-fimE-fimH; Without 4 genes: fimB-fimH, fimC-fimH, fimI-fimH; Without 5 genes: fimH. The gene combinations within the structure of P fimbriae operon: Complete operon: papAH-papC-papEF-papG; Without 1 gene: papAH-papC-papEF; Without 2 genes: papAH-papC. * Statistically significant.