MIC determination by broth microdilution to -lactam-antibiotics (penicillin G, cefotaxime, cefoperazone, cefquinome, ceftiofur), and disk diffusion confirmatory test for ESBL (ceftazidine (30μg)/ ceftazidine-clavulanic acid (30μg/10μg) and cefotaxime (30μg)/ cefotaxime-clavulanic acid (30μg/10μg)