A study on in-vitro anti microbial sensitivity pattern of the bacterial isolates obtained from bovine mastitis

A study was under taken to estimate the prevalence of bacterial agents associated with bovine mastitis in and around Shivamogga and Hassan of Karnataka State, India and to know their invitro susceptibility and resistance patterns to the commonly used antimicrobial drugs in the treatment of mastitis. A total of 117 milk samples were collected and subjected to bacteriological studies and in-vitro antimicrobial sensitivity test. In all, 117 milk samples subjected for isolation of bacteria yielded 132 bacterial isolates. The most predominant bacteria isolated were Staphylococcus aureus (27.3%) followed by Streptococcus spp. (26.5%), E. coli (18.2%), Klebsiella pneumoniae (12.1%), Pseudomonas aeruginosa (5.3%), Proteus mirabilis (0.76%) and Trueperella pyogenes (0.76%). The antibiogram studies revealed that most of the bacterial isolates were sensitive to chloramphenicol (56.8%) followed by enrofloxacin (36.36%) and cotrimoxazole (33.3%). However, due to the concerns about drug residues with chloramphenicol causing potential human health risks, the use of drugs like enrofloxacin and cotrimoxazole is proposed for the treatment of bovine mastitis in the study area.