COMPARATIVE SUSCEPTIBILITIES OF VARIOUS ANIMAL-PATHOGENIC MYCOPLASMASTO FLUOROQUINOLONES

The in vitro activities of six antimicrobial agents were tested agains t 162 mycoplasma strains of eight species isolated from poultry and li vestock at different geographic sites. Tiamulin was most active (MICs at which 90% of the isolates were inhibited [MIC(90)s], 0.025 to 0.25 mu g/ml); enrofloxacin and danofloxacin had near equivalent activities (MIC(90)s, 0.05 to 1.0 mu g/ml), but were much more active than flume quine (MIC(90)s, 1 to 50 mu g/ml). The MIC(90)s of tylosin and oxytetr acycline were 0.25 to > 100 mu g/ml and 0.25 to 100 mu g/ml, respectiv ely.