Table 1.

Distribution of minimum inhibitory concentrations (MIC) of various antimicrobial agents against equine Actinobacillus equuli isolates using the agar dilution test

The ECOFF, as determined by the NRI method is indicated as a vertical line. The strains showing acquired resistance are underlined. ^# the standard deviation of the normal distribution of wild type MIC values exceeds 1.2 log₂, the outcome can only result in a tentative estimate of the ECOFF and one can only speak of the “putative wild type group”.

^$ data available for 22 isolates, ^& no ECOFF is proposed for spectinomycin because all results were at the upper limit of the tested range; ^α indicates result for S. aureus ATCC 29,213; ^β indicates result for E. coli ATCC 25,922; ^γ indicates result for E. coli ATCC 35,218; for amoxicillin + clavulanic acid (2/1) and trimethoprim + sulfamethoxazole (1/19), the results of amoxicillin and trimethoprim, respectively, are shown.