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| Cow number | Number of strains/tested colonies | CTF treatment | MIC (µg/mL) | β-lactamase gene | |||||
| AMP(≥32)a | AMP/CVA | CFZ(≥32) | CXM(≥32) | CTF(≥8) | CTF/CVA | ||||
| 5 | 10/10 | + | >128 | 64/32 | 64–128 | 32 | 1 | 1/0.5 | −1(CtoT)/−18(GtoA)/−42(CtoT)/−82(AtoG)* |
| 7 | 1/10 | + | >128 | 64/32 | 128 | 32 | 2 | 2/1 | −1(CtoT)/−18(GtoA)/−42(CtoT)/−82(AtoG)* |
Breakpoint; *Mutations in the chromosomal ampC promoter region.
