Antimicrobial profiling of mastitis causing bacteria in buffalo milk

Abstract

Mastitis is causing huge economic losses to the dairy industry in India. The losses were mainly due to decreased milk production and treatment cost. This study was aimed to detect occurrence of mastitis in buffaloes. A total of 5,665 milk samples from buffaloes were processed for detection of mastitis by white side test (n=4,884) and culture examination (n=781). Overall, 2,808 (57.49%) milk samples were positive by white side test and 96.79% (n=756) samples were found positive by culture examination. Gram-positive and gram-negative bacteria were detected in 54.16% (n=423) and 31.11% (n=243) of the milk samples, respectively. Mixed infection of both was found in 10.62% (n=83) samples. While, Candida spp. was detected in 0.89% (n=7) samples only. Antibiotic sensitivity assay revealed that chloramphenicol was the most sensitive antibiotic against 71.61% samples in both gram-positive and negative bacterial isolates followed by enroloxacin, amikacin, levofloxacin, moxifloxacin and gentamicin in 71.09%, 61.77%, 58.85%, 58.59% and 55.99% samples, respectively. Kanamycin was most resistant against all isolates followed by neomycin (76.36%), norfloxacin (60.99%), amoxicillin+cloxacillin (52.78%), and ceftizoxime (51.85%).