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antimiicrobial susceptibility (for example, f-1haemolytic strep- tococci and Erysipcloh rix rhlfliopathile).Susceptibilitv test- ing is performed on almost all other pathogenic bacterial isolates.This study is based OIn 13,959 susceptibility tests per- formed from 1993 to 1998.Susceptibility to antimicrobial agents was determined by a tablet diffusion test on Mueller-Hinton II agar (Mueller-Hintoi II; Bectoin Dickinson Microbiology' System), supple- nmeinted with 5 per ceint bovine blood, using enrofloxacin ( 10 pg) accordinig to the imianufacturer's guidelines (Rosco Diagnostica; Talastrup) ((Casals and Pringler 1991).The iso-
Asrestrup et al. (2000) studied this question.