Table 4.

Antimicrobial resistance profiles and MICs for donor, recipient, and transconjugant isolates

Bacterial strain(s)MICa (μg/ml) of:
AMCAMPCEFCHLKANNALSTRSULTET
Donors
 CVM990 (E. coliO157:H7)444≤4 >64 ≤4 >256 >512 32
 CVM1884 (E. coliO111:NM)448≤4≤16≤4<32 >512 >32
Recipients
 JM263 (E. coliO157:H7)44 32 32 ≤16 >256 ≤32≤1288
 CVM1202 (H. alvei) >32 >32 >32 ≤4≤16≤4≤32≤128≤4
 CVM1203 (H. alvei) >32 >32 >32 ≤4≤16≤4≤32≤128≤4
 CVM1208 (H. alvei) >32 >32 >32 ≤4≤16≤4≤32≤128≤4
Transconjugants
 CVM990-JM26348 32 32 ≤16 >256 >256 >512 >32
 CVM990-CVM1202 >32 >32 >32 ≤4≤16≤4 128 >512 >32
 CVM990-CVM1203 >32 >32 >32 ≤4≤16≤4 128 >512 >32
 CVM990-CVM1208 >32 >32 >32 ≤4≤16≤4 128 >512 >32
 CVM1884-JM26348 32 32 ≤16 >256 ≤32 >512 >32
 CVM1884-CVM1202 >32 >32 >32 ≤4≤16≤4 128 >512 >32
 CVM1884-CVM1203 >32 >32 >32 ≤4≤16≤4 128 >512 >32
 CVM1884-CVM1208 >32 >32 >32 ≤4≤16≤4 128 >512 >32
  • a MICs were determined via microdilution methods according to NCCLS standards (20, 21). Abbreviations: AMC, amoxicillin-clavulanic acid; AMP, ampicillin; CEF, cephalothin; CHL, chloramphenicol; KAN, kanamycin; STR, streptomycin; SUL, sulfamethoxazole; TET, tetracycline. Numbers in boldface represent resistant phenotypes.