Occurrence and Characteristics of in a Hungarian Dairy Farm during a Control Program.

In this research, our aim was to assess the occurrence of in a Hungarian large-scale dairy farm during the control program conducted in the course of our studies. Furthermore, the phenotypic and genotypic properties of the isolates (type of haemolysis, antibiotic susceptibility, staphylococcal enterotoxin (SE) gene carrying ability and type) were determined. was detected in all bulk tank milk samples collected during this study. Two different types were identified among the 17 strains isolated in the farm. A total of 14 of the 17 studied strains (82%) showed β-haemolysis on blood agar, 2/17 strains (12%) expressed double zone and 1/17 strains (6%) showed weak β-haemolysis. All strains were susceptible to most antibiotics tested (cefoxitin, chloramphenicol, clindamycin, erythromycin, gentamicin, tetracycline and trimethoprim/sulphamethoxazole), but all strains were resistant to penicillin G. A total of 11 of the 17 strains (65%) were found to harbour , , , , genes; 4/17 strains (24%) harboured , , , genes and 2/17 strains (11%) harboured gene. Since the new SEs/SEls can also cause foodborne outbreaks potentially and all strains were found to be resistant to penicillin G, it is essential to decrease and keep the prevalence of low in the dairy farm and the implementation of the control program is also highly justified. The results showed that the count decreased by the end of our studies, so the control program was proved to be effective.