TABLE 1.

Pathotypes and antimicrobial resistance of all E. coli isolates

PathotypeaNo. of isolates (%)
TotalWith antimicrobial resistanceb
ExPEC
    UPEC28 (9.1)4 (1.3)
    MNEC6 (2.0)2 (0.7)
    Incomplete ExPEC47 (15.3)11 (3.6)
    Subtotal81 (26.4)17 (5.6)
Enteric E. coli
    EAEC5 (1.6)3 (1.0)
    ETEC1 (0.3)1 (0.3)
    Atypical EPEC1 (0.3)0 (0.0)
    Subtotal7 (2.2)4 (1.3)
Nonpathogenic220 (71.4)22 (7.1)
Total308 (100.0)43 (14.0)
  • a Pathotypes were attributed to E. coli samples based on their sets of virulence genes or markers, as follows: for EAEC, capU, shf, virK, and aggregative adherence fimbria-encoding genes; for ETEC, heat-stable and heat-labile toxin-encoding genes and F4 and F18 fimbria-encoding genes; for atypical EPEC, espA, espB, tir, eae and variants, and absence of bfpA; for UPEC, P pilus-encoding genes, hlyA, S fimbria-encoding genes, chuA, fepC, cnf1, irp1, irp2, fyuA, iroN, and usp; for MNEC, ibeA, neuA, and neuC; and for incomplete ExPEC, kpsM, iutA, iucD, traT, malX, irp1, irp2, fyuA, chuA, fepC, iss, and kfiB. Isolates which did not possess any virulence genes or had a few scattered virulence-related genes were considered nonpathogenic.

  • b E. coli isolates carrying at least one antimicrobial resistance gene.