Pathogens isolated from clinical mastitis in Murrah buffaloes and their antibiogram

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Aim: To determine the etiology of clinical mastitis in Murrah buffaloes and to develop an antibiogram of organisms isolated. Materials and Methods:A total of 564 quarter milk samples of 144 buffaloes suffering from clinical mastitis received in Veterinary College Central Laboratory were inoculated on blood agar, MacConkey's lactose agar and sabouraud dextrose agar.Bacteria isolated were characterized to the species level and subjected to in-vitro antimicrobial sensitivity testing.Results: Out of 564 quarters examined for mastitis, 320 (56.73%) quarters were found culturally positive showing isolation of Staphylococcus aureus 140 (38.04%),Streptococcus dysgalactiae 112 (30.43%),Streptococcus agalactiae 13 (3.53%),Escherichia coli 74 (20.10%) and Corynebacterium pyogenes 29 (7.88%).On carrying antibiogram staphylococci and streptococci revealed high sensitivity towards chloramphenicol, gentamicin, amikacin and enrofloxacin.Streptococci showed high sensitivity towards ceftriaxone and cefaperazone also.E. coli was found highly sensitive to chloramphenicol and gentamicin.C. pyogenes was sensitive to the majority of antibiotics.Conclusion: S. aureus was the most predominant bacteria isolated from mastitis cases and irrespective of the isolates chloramphenicol was found to be most sensitive when tested in-vitro.