Table 1.
MIC profiles of all isolates with an intermediate to resistant phenotype in the AST assay.
| Strainsc | Description | MIC profilea (μg/mL) (using Etest® MIC stripsb) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| XL | AM | AZ | CL | CT | FX | GM | NA | SM | SX | TE | ||
| E. coli ATCC25922 | Test control | 8 | 4 | 7 | 8 | 0.09 | 3 | 0.38 | 3 | 2 | 64 | 2 |
| Sakai | Control O157 | 6 | 3 | 4 | 8 | 0.09 | 6 | 0.25 | 4 | 3 | 128 | 3 |
| EDL933 | Control O157 | 4 | 3 | 4 | 8 | 0.08 | 8 | 0.25 | 4 | 2 | 64 | 3 |
| EC4115 | Control O157 | S | S | 1 | 6 | S | 3 | S | S | S | S | 3 |
| JEONG-1266 | Control SS-O157 | 6 | 3 | 4 | 8 | 0.06 | 6 | 0.38 | 4 | 6 | 128 | 2 |
| SS-17 | Control SS-O157 | 4 | 2 | 3 | 6 | 0.06 | 4 | 0.38 | 3 | 6 | 96 | 3 |
| SS-52 | Control SS-O157 | 6 | 3 | 3 | 8 | 0.08 | 6 | 0.38 | 6 | 6 | 96 | 3 |
| 870-1 | E. coli | S | S | 1 | S | S | S | S | S | 1 | S | 6 |
| 870-2 | E. coli | 8 | 4 | 0.75 | 256 | S | S | S | S | 384 | 1024 | 128 |
| 870-4 | E. coli | 3 | 2 | 4 | 4 | 0.04 | 2 | 0.38 | 4 | 1.5 | 48 | 6 |
| 888-1 | E. coli | S | S | 1.5 | S | S | S | S | S | S | S | 16 |
| 888-2 | E. coli | 6 | 3 | 3 | 8 | 0.09 | 6 | 0.25 | 6 | 6 | 1024 | 4 |
| 888-4 | E. coli | S | S | 1.5 | S | S | S | S | S | 1 | 128 | S |
| 912-1 | E. coli | S | S | 1.5 | S | S | S | S | 6 | 2 | 1024 | S |
| 912-2 | E. coli | S | S | 1.5 | S | S | S | S | S | 3 | 192 | 96 |
| 912-4 | E. coli | 3 | 2 | 8 | 8 | 0.03 | 3 | 0.38 | 4 | 8 | 1024 | 48 |
| 914-1 | E. coli | S | S | 2 | S | S | 4 | S | S | 1 | S | 4 |
| 914-2 | E. coli | S | 6 | 1 | S | S | S | S | S | 1 | S | S |
| 914-3 | E. coli | 8 | 8 | 2 | S | S | S | S | S | 1.5 | 128 | S |
| 914-4 | E. coli | 8 | 6 | 2 | S | S | S | S | S | 1.5 | S | S |
| 887-1 | E. coli (STEC) | 4 | 4 | 7 | 6 | 0.06 | 3 | 0.38 | 4 | 6 | 48 | 3 |
| 887-2 | E. coli (STEC) | 6 | 4 | 4 | 6 | 0.09 | 3 | 0.38 | 4 | 6 | 48 | 3 |
| 887-3 | E. coli (STEC) | 8 | 4 | 4 | 6 | 0.08 | 2 | 0.38 | 4 | 6 | 48 | 3 |
| 887-4 | E. coli (STEC) | 6 | 4 | 4 | 6 | 0.06 | 3 | 0.38 | 6 | 2 | 48 | 3 |
| C-1 | SS-O157 | 6 | 4 | 3 | 6 | 0.09 | 6 | 0.25 | 4 | 4 | 128 | 2 |
| C-2 | SS-O157 | 6 | 3 | 4 | 8 | 0.06 | 6 | 0.38 | 4 | 6 | 64 | 2 |
| C-4 | SS-O157 | S | S | 1 | S | S | S | S | S | S | 192 | 3 |
| C-5 | SS-O157 | S | S | 1 | 6 | S | S | S | S | S | 192 | S |
| C-7 | SS-O157 | 6 | 3 | 3 | 8 | 0.06 | 6 | 0.38 | 8 | 4 | 128 | 3 |
| C-9 | SS-O157 | S | S | 1 | S | 0.06 | S | S | S | 1.5 | S | S |
| C-11 | SS-O157 | S | S | 1 | 6 | 0.05 | S | S | S | S | 64 | S |
| C-12 | SS-O157 | S | S | 1 | 8 | 0.05 | S | S | S | S | 128 | 3 |
| C-13 | SS-O157 | S | S | 1 | S | S | S | S | S | S | 192 | S |
| C-14 | SS-O157 | S | S | 1 | 6 | S | S | S | S | 3 | 128 | S |
| C-18 | SS-O157 | S | S | 1.5 | S | S | S | S | S | 3 | 96 | S |
| C-19 | SS-O157 | S | S | 1.5 | 4 | 0.05 | S | S | S | 4 | S | S |
| C-22 | SS-O157 | S | S | 0.75 | S | S | S | 0.25 | S | 2 | 96 | S |
| C-32 | SS-O157 | S | S | 1 | 8 | S | S | S | S | 2 | S | S |
| C-38 | SS-O157 | S | S | 1 | 8 | 0.06 | S | S | S | 2 | 192 | 4 |
| C-40 | SS-O157 | 4 | 4 | 4 | 8 | 0.06 | 6 | 0.38 | 4 | 6 | 64 | 2 |
| C-45 | SS-O157 | 6 | 4 | 3 | 6 | 0.11 | 6 | 0.25 | 4 | 6 | 192 | 3 |
| C-49 | SS-O157 | 6 | 4 | 4 | 8 | 0.06 | 4 | 0.38 | 4 | 6 | 128 | 3 |
| C-66 | SS-O157 | S | S | 1 | 8 | 0.06 | S | S | 6 | S | 1024 | S |
| C-77 | SS-O157 | 6 | 3 | 3 | 6 | 0.06 | 4 | 0.5 | 4 | 8 | 48 | 3 |
| C-80 | SS-O157 | 6 | 3 | 3 | 8 | 0.06 | 6 | 0.25 | 8 | 0.75 | 64 | 3 |
| C-85 | SS-O157 | S | S | 1 | S | 0.05 | S | S | S | S | 256 | S |
| C-87 | SS-O157 | S | S | 1 | S | 0.05 | S | S | S | 1 | 1024 | S |
| C-88 | SS-O157 | S | 4 | 1 | S | 0.06 | S | S | S | 1 | 256 | S |
| C-90 | SS-O157 | S | S | 1 | S | S | S | S | S | S | 256 | S |
| C-99 | SS-O157 | 4 | 3 | 4 | 6 | 0.08 | 6 | 0.25 | 6 | 1.5 | 64 | 3 |
| C-104 | SS-O157 | 4 | 3 | 4 | 8 | 0.09 | 6 | 0.25 | 6 | 24 | 1024 | 256 |
aMIC Profile: MIC of 11 antibiotics was determined in all the isolates that were either Intermediate or Resistant on AST assay; remaining isolates are labelled S against the MIC strip to which the isolates were susceptible in AST assay. bAntibiotic MIC Strips: XL = Amoxicillin/Clavulanic acid; AM = Ampicillin; AZ = Azithromycin; CL = Chloramphenicol; CT = Cefotaxime (in place of Ceftiofur); FX = Cefoxitin; GM = Gentamicin; NA = Nalidixic Acid; SM = Streptomycin; SX = Sulfisoxazole; TE = Tetracycline. cOnly one representative isolate was used for MIC testing if AST profile was the same.