AIRBORNE BORDETELLA-BRONCHISEPTICA ISOLATES IN PIGSTIES - RESISTANCE TO CHEMOTHERAPEUTICS

Follow-up investigations were conducted to test 184 airborne Bordetell a bronchiseptica strains in farrowing houses and 563 strains in weaner houses for their responsiveness to 14 chemotherapeutics. Response of all strains tested was quite uniform to the substances involved. High sensitivity was recordable to neomycin, mebacid, trimethoprim-sulphame razine, chloramphenicol, oxytetracycline, colistin, gentamycin and nal idixid acid. The strains proved to be resistant to penicillin, strepto mycin, oxacillin and lincomycin. Differentiated responses of the B. br onchiseptica strains tested were established with regard to ampicillin and nitrofurantoin. The point is made that analysis of B. bronchisept ica flora in their air in livestock accomodation might be helpful in o btaining information on current resistance to chemotherapeutics in a g iven herd of farm animals.