Published in Scientific Works. Series C. Veterinary Medicine, Vol. LXXI, Issue 1
Written by Roxana Ionela DRUGEA, Mădălina Iulia SITEAVU, Elena PITOIU, Stelian BĂRĂITĂREANU
Staphylococcus chromogenes (St. chromogenes) continues to be one of the primary causative agents of mastitis in dairy cattle. This retrospective study aimed to present the trends of antimicrobial resistance in St. chromogenes isolated from raw milk samples of dairy cows with subclinical and clinical mastitis over a six-year period. From January 2018 to December 2023, a total of 79 St. chromogenes isolates were evaluated for antimicrobial resistance against 22 antibiotics. The current study revealed a significant increase in resistance to various antimicrobial agents. For example, amoxicillin resistance increased from 23.33% to 50.00%, marbofloxacin from 12.50% to 25.00%, doxycycline from 13.33% to 75.00%, oxytetracycline from 13.33% to 50.00%, and streptomycin from 16.67% to 50.00%. The increasing trend of antimicrobial resistance underscores the need for robust infection control strategies and judicious antibiotic use in dairy farms. To summarise, this study can serve as an essential resource for evaluating treatment protocols and mitigating the further spread of resistance.
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