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. 2021 May 18;65(6):e02658-20. doi: 10.1128/AAC.02658-20

TABLE 1.

Conjugation frequency and fold change in mating assays for E. coli RZ211(pOX38)a

Antibiotic MIC (μg/ml) Control
1/4 MIC
1/2 MIC
1/2 MIC + EDA
CF Fold change CF Fold change CF Fold change CF Fold change
Ciprofloxacin 0.004 1.1 × 100 ± 1.2 × 100 1 3.3 × 100 ± 2.8 × 100 3.3 2.1 × 101 ± 1.9 × 101 21 3.2 × 100 ± 3.7 × 100 3.2
Levofloxacin 0.032 7 × 10−1 ± 5 × 10−1 1 4.3 × 100 ± 4.8 × 100 6 2.6 × 101 ± 9.8 × 101 37 5.3 × 100 ± 3.7 × 100 7.5
Trimethoprim 0.06 4 × 10−1 ± 1.2 × 10−1 1 4 × 100 ± 2.8 × 100 10 4.4 × 100 ± 2.3 × 100 11 2.5 × 100 ± 2 × 10−1 6
Fosfomycin 4 6 × 10−1 ± 1.1 × 10−1 1 1.6 × 100 ± 9 × 10−1 2.7 4.4 × 100 ± 1.8 × 100 7.3 1.3 × 100 ± 4.5 × 10−1 2.2
Amoxicillin >512 7.5 × 10−1 ± 3.4 × 10−1 1 2 × 100 ± 9.8 × 10−1 2.7 2.3 × 100 ± 7.5 × 10−1 3 9.5 × 10−1 ± 7 × 10−2 1.3
Amoxicillin/clavulanic acidb 4 1.8 × 100 ± 1 × 100 1 2.2 × 101 ± 1.6 × 101 12.2 2.4 × 101 ± 1.8 × 101 13 1.3 × 101 ± 1 × 101 7.2
Nitrofurantoin 4 2.8 × 10−1 ± 2.5 × 10−1 1 1.4 × 101 ± 1.1 × 101 50 3 × 101 ± 9.8 × 100 107 1.5 × 101 ± 4.2 × 100 50
Cefalexin 512 7.6 × 10−1 ± 2.7 × 10−1 1 1.6 × 100 ± 1.2 × 100 2.1 5 × 100 ± 2.5 × 100 6.6 1.5 × 100 ± 1.2 × 100 2
Azithromycin 2 2.3 × 100 ± 6.6 × 10−1 1 3.3 × 100 ± 1.4 × 100 1.4 3.2 × 100 ± 1.5 × 100 1.4 2.9 × 100 ± 9.8 × 10−1 1.3
Sulfonamides 32 9 × 10−1 ± 3 × 10−1 1 1.1 × 100 ± 1.3 × 100 1.2 1.7 × 100 ± 1.7 × 100 1.8 9 × 10−1 ± 9 × 10−1 1
Tetracycline 2 9 × 10−1 ± 3 × 10−1 1 1.3 × 100 ± 1.3 × 100 1.4 1.2 × 100 ± 1.3 × 100 1.3 1.2 × 100 ± 1.1 × 100 1.3
Erythromycin 32 4.4 × 100 ± 3.6 × 100 1 2.4 × 100 ± 2.2 × 100 0.5 4.1 × 100 ± 9.1 × 10−1 0.9 2.5 × 100 ± 2.8 × 10−1 0.6
Amikacin 6 7.5 × 10−1 ± 3.4 × 10−1 1 1 × 100 ± 5.2 × 10−1 1.3 1.5 × 100 ± 7 × 10−2 1.9 8 × 10−1 ± 1.4 × 10−1 1
a

EDA, edaravone (0.1 mM); CF, conjugation frequency. Statistically significant fold changes are in bold (P < 0.05).

b

Fixed concentration of clavulanic acid at 2 μg/ml.