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Table 5 Numbers and profiles of antibiotic resistance (AMR) of E. coli O157:H7 isolated from feces collected in Alberta, Canada in 2007 and number of isolates susceptible to all antibiotics (SUS) by feedlot and pen for super-shedders (SS) x and low-shedders (LS) y of E. coli O157:H7

From: Genetic diversity and antimicrobial resistance among isolates of Escherichia coliO157: H7 from feces and hides of super-shedders and low-shedding pen-mates in two commercial beef feedlots

Feedlot Pen No. of resistant SS isolates (%) Resistance toz No. of resistant LS isolates (%) Resistance to Total No. SUS
A 1 0 (0) ND 2 (12) tetracycline, sulfasoxazole, neomycin, streptomycin , tetracycline 19
  2 1 (3) ampicillin, sulfasoxazole, streptomycin, tetracycline 2 (6) tetracycline, sulfasoxazole, streptomycin, sulfamethoxazole/trimethroprim 71
  3 0 (0) ND 1(4) tetracycline 35
  4 2 (11) ceftazidime, streptomycin, sulfasoxazole, sulfamethoxazole/trimethro-prim 2(9) tetracycline, tetracycline, streptomycin 41
  5 0 (0) ND 1 (3) sulfasoxazole, streptomycin, tetracycline 46
  6 0 (0) ND 1(3) tetracycline 34
  7 0 (0) ND 0 (0) ND 1
B 1 0 (0) ND 3 (6) tetracycline 78
  2 0 (0) ND 0 (0) ND 94
  3 0 (0) ND 1(6) tetracycline 26
  4 0 (0) ND 1(9) tetracyline 12
Total   3 (2)   14 (5)   457
  1. xSuper-shedder, shedding at least 104 CFU E. coli O157:H7/g feces.
  2. yLow-shedder, shedding < 104 CFU E. coli O157:H7/g feces.
  3. zAntibiotic resistance: No resistance to enrofloxacin, amoxicillin/clauvanate or cetiofur was detected.