Antimicrobial Resistance and Biofilm Formation in Coagulase Negative Staphylococci Isolated from Bovine Clinical Mastitis
DOI:
https://doi.org/10.48165/ijvsbt.20.4.29Keywords:
Biofilm,, Bovine, Clinical mastitis,, CoNS.Abstract
Bovine mastitis is a common and economically significant disease that affects dairy cows and buffaloes. Staphylococci are considered as a most common cause of bovine mastitis. The present research work was undertaken with the objective to isolate and identify coagulase-negative staphylococci (CoNS) by cultural, biochemical, and molecular methods from bovine mastitic milk samples, and to study their antimicrobial resistance patterns as well as the biofilm-producing ability. The investigation was carried out on 281 bovine clinical mastitis milk samples collected in and around Junagadh. Based on cultural and molecular methods, 34.87% (98/281) samples yielded Staphylococcus isolates. Through the conventional standard tube coagulation test, 16.72% (47/281) isolates were identified as CoNS. Mannitol fermentative patterns revealed 36.17% (17/47) CoNS isolates as fermentative, while 63.82% (30/47) CoNS isolates as non-fermentative. CoNS isolates showed high resistance against penicillin-G (64.95%), followed by erythromycin (57.34%), while the least resistance was observed against oxytetracycline (17.02%). Out of 47 CoNS isolates, 76.59% (36/47) were biofilm producers, while 23.40% (11/47) were non-biofilm producers.
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