Antimicrobial sensitivity of pathogens causing subclinical mastitis in goats in Bulgaria
Submitted26-01-2017|
Accepted28-06-2017|
First Online 29-07-2017|
The aim of this study was to analyze the antibacterial sensitivity of microbial isolates causing subclinical mastitis in goats. The classical Bauer disk-diffusion assay was used to determine the sensitivity of the coagulase-negative staphylococcal (CNS) isolates and isolates belonging to other genera. In all the tested isolates, the highest rates of resistance were observed to be to Oxacillin (81.25%) and Novobiocin (75%), followed by Penicillin (68.75%), Tetracycline (37.5%) and Amoxycillin (31.25%). There was low prevalence of resistance to Cefotaxime (12.5%), Thiamphenicol (6.25%), Cefuroxim (6.25%), Cefuroxim (6.25%), Amikacin (6.25%), Sulfamethoxazole + Ttrimethoprim (6.25%) and Gentamicin (6.25%). Staph. intermedius showed resistance to the highest number of antimicrobial agents, four ones (28.57%), whereas Staph. haemolyticus was the least resistant isolate, which was sensitive to nearly all of the tested antimicrobials and showed intermediate sensitivity to only three ones (21.43%). Among the microorganisms other than CNS, B.brevis and Å.coli showed resistance to the highest number of antimicrobial agents (42.86%).
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