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Table 1 Resistance (percent, 95% CI in brackets) and distribution (percent) of MICs for Escherichia coli(n = 95).

From: Antimicrobial resistance and virulence factors in Escherichia coli from swedish dairy calves

Antimicrobial Range tested (mg/L) Cut-off value (mg/L) Resistance Minimum Inhibitory Concentration (mg/L)
     ≤0.03 0.06 0.12 0.25 0.5 1 2 4 8 16 32 64 128 256 512 1024 2048 >2048
Ampicillin 0.25-32 >8 27.4 (18.7-37.5)     0 0 11.6 48.4 12.6 0 0 1.1 26.3       
Ceftiofur 0.12-16 >1 0.0 (0.0-3.8)    0 38.9 53.7 7.4 0 0 0 0         
Chloramphenicol 1-128 >16 5.3 (1.7-11.9)       1.1 9.5 74.7 9.5 0 0 0 0 5.3     
Enrofloxacin 0.03-4 >0.12 13.7 (7.5-22.3) 18.9 61.1 6.3 3.2 6.3 2.1 1.1 0 1.1          
Florfenicol 4-32 >16 0.0 (0.0-3.8)         66.3 30.5 3.2 0        
Gentamicin 0.5-64 >2 0.0 (0.0-3.8)      25.3 68.4 6.3 0 0 0 0 0       
Nalidixic acid 1-128 >16 13.7 (7.5-22.3)       2.1 31.6 51.6 1.1 0 1.1 3.2 4.2 5.3     
Neomycin 2-16 >8 5.3 (1.7-11.9)        87.4 5.3 2.1 0 5.3        
Streptomycin 2-256 >16 44.2 (34.0-54.8)        1.1 16.8 32.6 5.3 2.1 14.7 8.4 10.5 8.4    
Sulphonamide 16-2048 >256 31.6 (22.4-41.9)           47.4 17.9 3.2 0 0 0 1.1 1.1 29.5
Tetracycline 0.5-64 >8 31.6 (22.4-41.9)       37.9 27.4 2.1 1.1 0 1.1 0 30.5      
Trimethoprim 0.25-32 >2 5.3 (1.7-11.9)     37.9 41.1 14.7 1.1 1.1 0 0 0 4.2       
  1. Range of concentrations tested and cut-off values for resistance are indicated. MICs equal to or lower than the lowest concentration tested are given as the lowest tested concentration. MICs above the range of concentrations tested are given as the concentration closest to the range. MICs above the cut-off value for resistance are given in bold lettering.
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