Vol. 11, Special Issue 11 (2022)

Author(s):
BK Pati and Reena Mukherjee

Abstract:
Staphylococcus aureus (S. aureus) is identified as chief etiological agent among the various mastitis pathogens responsible for sub clinical and chronic mastitis and most challenging for the clinician to treat such cases. In the present study 435 cows were screened for mastitis by California mastitis test and Somatic cell count from the Northern tropical region of India. On the basis of cultural and biochemical properties 61 isolates were identified as S. aureus. Those isolates were subjected to ABST with 18 antibiotic discs belonging to 14 different class of antibiotics. The sensitivity, intermediate, resistance (SIR) pattern revealed multidrug resistant S. aureus, as the isolates were resistant to more than 3 different classes of antibiotic. The isolates revealed maximum resistance > 50 % towards Penicillin, Aminopenicillin, Betalactum, Macrolide, Sulpha and Tetracycline class of antibiotics. The sensitivity pattern revealed maximum susceptibility i.e. > 50 %, towards Fluroquinolones, Oxazolidone, Glycopeptide and extended spectrum betalactum inhibitors class of antibiotics. SIR pattern revealed 100 % susceptibility for Vancomycin. The phenotypic findings of the present study might help to understand the distribution of prevalent S. aureus infection in the dairy farms and antibiotic sensitivity pattern will help to choose most appropriate antibiotic hence help to adopt appropriate strategies for the management and control of bovine mastitis.