TABLE 5.
Antimicrobial susceptibilities of transconjugants grouped by presence of the armA or rmtB gene and by plasmid incompatibility groupa
| Antimicrobial agent | MIC50 for isolates with the indicated gene and Inc plasmidb:
|
||||||
|---|---|---|---|---|---|---|---|
|
armA (n = 143)
|
rmtB (n = 47)
|
||||||
| FIIAs (n = 20) | L/M (n = 37) | A/C (n = 7) | F (n = 7) | NI (n = 75) | A/C (n = 41) | F (n = 6) | |
| Ampicillin | 512 | >512 | >512 | >512 | >512 | >512 | >512 |
| Aztreonam | <1 | 8 | <1 | <1 | 32 | 8 | <1 |
| Ceftazidime | <1 | 2 | <1 | <1 | 32 | 2 | <1 |
| Cefotaxime | <1 | 64 | <1 | <1 | 4 | 64 | <1 |
| Cefepime | <1 | 8 | <1 | <1 | <1 | 8 | <1 |
| Cefoxitin | 32 | 4 | 1 | 2 | 32 | 4 | 4 |
| Ciprofloxacin | 0.25 | 0.03 | 0.015 | 0.03 | 0.25 | 0.015 | 0.25 |
| Chloramphenicol | 4 | 4 | 64 | 4 | 4 | 128 | 4 |
| Streptomycin | 256 | 4 | 512 | 256 | 256 | 256 | 4 |
| Sulfamethoxazole | 16 | 16 | >512 | 16 | 16 | >512 | 16 |
| Trimethoprim | <1 | <1 | <1 | 8 | <1 | >512 | <1 |
| Tetracycline | <1 | <1 | 1 | <1 | <1 | 32 | <1 |
a
Groups with fewer than five strains were excluded from calculations of MIC50s.
b
Numbers of strains included in each group are shown in parentheses. NI, not identified.