The comparative evaluation of antibiotic therapy in the treatment efficiency of chronic bronchitis in horses

The susceptibility testing of microbial pathogens obtained by transtracheal lavage and bronchoalveolar lavage from the respiratory system of horses and cultured were compared. The antibiotics were compared with each other (inhibition zone diameter and resistance/sensibility of etiologic agents) to determine the best antibiotic that can be administered in horses with respiratory infections. Comparison of different families of antibiotics were also done (by average inhibition area diameter). Among the samples obtained by means of a bronchoalveolar lavage there were no microorganisms with resistance to florfenicol, enrofloxacin, and amoxicillin. The highest average inhibition zone diameters were: penicillin (36 mm), ciprofloxacine (25 mm), enrofloxacin (22.5 mm) and tetracycline (20 mm). The best antibiotics for treating the pathogens in samples obtained by means of a transtracheal lavage were: cefquinome (23 mm), tetracycline (21 mm), trimetoprim (21 mm) and florfenicol (19.83 mm). Further (and more elaborate) studies are required to determine the best antibiotics for the treatment of respiratory infections