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Coagulase-negative staphylococci (CNS) are generally considered to be   opportunistic pathogens. Controlling CNS mastitis is difficult because the   epidemiology is not clear, and the CNS group consists of about 40 different   Staphylococcus species. Therefore, the aim of this study was to determine the   prevalence of coagulasenegative staphylococci in milk of the cows with   subclinical mastitis, as well as to determine different CNS species isolated   from quarter milk samples for their susceptibility to antimicrobials used   commonly for mastitis therapy. On the farm where there was found an increase   of somatic cells in bulk milk, 112 dairy cows were examined by mastitis test.   From 52 udder quarters where mastitis test showed an increase of somatic   cells, milk samples were taken for bacteriological examination. For isolating   the causes of mastitis there was used blood agar. Identification of the   causative agents of mastitis was carried out on the basis of colony   appearance on blood agar and their physiological characteristics.   Coagulasepositive staphylococci sensitivity which cause mastitis was tested   by Kirby Bauer method. For susceptibility testing there were used   commercially produced discs containing: 10 IU penicillin,   amoxicillin/clavulanic acid (20 +10 μg), cloxacillin 25 μg, 30 μg   amoxicillin, cephalexin 30 μg, ceftiofur 30 μg, 15 μg lincomycin, gentamicin   and tetracycline 30 μg. The sensitivity of microorganisms was evaluated on   the basis of inhibition zone diameter recommended by the manufacturer and was   labeled as sensitive (S) moderately sensitive (I) or resistant (R).   Coagulase-negative staphylococci were isolated from 61.53% of samples from   cows with subclinical mastitis, making them the most common cause of   subclinical mastitis. The highest resistance of coagulase-negative   staphylococci was found to penicillin G (58.33% of isolates). Full   sensitivity of coagulase-negative staphylococci was found to amoxicillin /   clavulanic acid (100% of isolates), a good sensitivity to ceftiofur (83.33%   of isolates), cefalexin (70.83% of isolates) and ceftriaxone (41.66% of   isolates). [Projekat Ministarstva nauke Republike Srbije, br. TR 31086

Finding of coagulase negative staphylococci in the herd with an increased number of somatic cells in milk and their antimicrobial susceptibility