TABLE 4.

Characterization of antimicrobial resistance genes present in E. coli isolates

Antimicrobial agent(s)Antimicrobial resistance geneaNo. (%) of isolates carrying the resistance geneb
Ampicillin bla TEM 15 (4.9)
bla OXA-1 2 (0.6)
Tetracycline tet(A)16 (5.2)
tet(B)8 (2.6)
tet(C)5 (1.6)
tet(D)1 (0.3)
Streptomycin, spectinomycin ant(3")-Ia15 (4.9)
Gentamicin aac(3)-IIa1 (0.3)
Kanamycin, neomycin aph(3′)-Ia3 (1.0)
Chloramphenicol catI 4 (1.3)
Trimethoprim dhfrI 5 (1.6)
dhfrVII 2 (0.6)
Sulfonamide sulI 6 (1.9)
sulII 13 (4.2)
  • a After hybridization, all isolates exhibited negative results with probes specific for blaSHV, blaOXA-7, blaPSE-4, blaCTX-M, tet(E), tet(Y), ant(2")-Ia, aac(3)-IV, aph(3′)-IIa, catII, catIII, floR, dhfrV, dhfrIX, dhfrXIII, and dhfrXV.

  • b Percentages were calculated as follows: number of isolates with resistance gene/total number of E. coli isolates × 100. The total number of E. coli isolates was 308.