TABLE 1.
Antimicrobial susceptibility profiles of Salmonella and E. coli strains used in conjugation experimentsa
| Strain | Designation | MIC (μg/ml) of antimicrobial agent
|
Presence or absence of:
|
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AUG | AMP | TIO | AXO | CEP | FOX | CHL | KAN | NAL | STR | SMX | TET | CIP | GEN | blaCMY | Integron | ||
| CVM20776 | Donor (serotype Newport) | >32 | >32 | >8 | 16 | >32 | >16 | >32 | <8 | ≤4 | >64 | >512 | >32 | 0.015 | 0.25 | + | − |
| CVM21547 | Donor (serotype Newport) | 2 | 2 | ≤0.25 | ≤0.25 | 4 | ≤4 | ≤4 | >64 | ≤4 | >64 | >512 | >32 | 0.015 | 16 | − | + |
| CVM19752 | Recipient (E. coli) | 2 | 4 | ≤0.25 | ≤0.25 | 16 | 4 | 8 | <8 | >32 | <32 | <16 | 4 | >4 | 1 | − | − |
| 20776/19752 | Transconjugant (E. coli) | >32 | >32 | >8 | 32 | >32 | >16 | >32 | <8 | >32 | >64 | >512 | >32 | >4 | 0.5 | + | − |
| 21547/19752 | Transconjugant (E. coli) | 2 | 4 | ≤0.25 | ≤0.25 | 8 | 4 | 4 | >64 | >32 | >64 | >512 | >32 | >4 | >16 | − | + |
a
AUG, amoxicillin-clavulanic acid; AMP, ampicillin; TIO, ceftiofur; AXO, ceftriaxone; CEP, cephalothin; FOX, cefoxitin; CHL, chloramphenicol; KAN, kanamycin; NAL, nalidixic acid; STR, streptomycin; SMX, sulfamethoxazole; TET, tetracycline; CIP, ciprofloxacin; GEN, gentamicin. Numbers in bold are resistance breakpoints.