Prevalence of Methicillin-resistant Staphylococcal Mastitis in Ruminants

The objectives of this work are to study the prevalence of staphylococcal mastitis, evaluate the resistance profile of these strains to antibiotics and the frequency of methicillin-resistant staphylococci in order to better define an effective therapeutic and preventive strategy. Milk samples from 41 females (cow, ewe and goat) were collected aseptically, and in the first step bacteriological tests were performed, including isolation and identification tests, to study the sensitivity of isolated staphylococci to nine antibiotics, using the antibiotic susceptibility reference method (agar dilution). The results were interpreted according to the criteria of Veterinary recommendations of the antibiotic susceptibility testing committee of the French microbiology society 2018. The results of bacteriological analyses of milk showed a significant prevalence of methicilin-resistant staphylococci mastitis (19.45%), including 17.85% of CSN and 1.2% for MRSA. The study of the antibiotic resistance profile of these isolated staphylococcus strains showed the high resistance of tetracycline with a frequency of 75% for CSP and 25% for CSN. This during vancomycin remains the most active antibiotic (100%) for both types of staphylococci.