TABLE 2

Molecular determination of antimicrobial resistance in 126 E. coli isolates

Antibiotic classSpecific traitNo. (%) of isolatesP valuea
ST131 E. coli isolates (group 1; n = 43)Non-ST131 E. coli isolates (group 2; n = 40)Fecal E. coli isolates (group 3; n = 43)Group 1 vs group 2Group 1 vs group 3
Tetracyclinestet(A)24 (56)17 (43)7 (16)<0.001
tet(B)5 (12)22 (55)10 (23)<0.001
AminoglycosidesstrA33 (77)19 (48)24 (56)0.0060.040
strB15 (35)7 (18)16 (37)0.073
Fluoroquinoloneaac(6′)-lb-cr36 (84)17 (43)36 (84)<0.001
Sulfonamidessul120 (47)17 (43)10 (23)0.024
sul25 (12)12 (30)22 (51)0.038<0.001
Trimethoprimdfr18 (42)7 (18)21 (49)0.016
dhfr15 (35)3 (8)5 (12)0.0020.011
  • a P values (determined by Fisher's exact test, two-tailed) are shown when P is <0.05.