title: Species distribution and resistance patterns to growth-promoting antimicrobials of enterococci isolated from pigs and chickens in Korea.
abstract: A total of 147 Enterococcus faecium and 165 Enterococcus faecalis isolates from fecal samples of chickens and pigs at slaughterhouses in Korea were tested for their resistance to 8 growth-promoting antimicrobials commonly used in animals and quinupristin and dalfopristin. Resistance to most antimicrobials was very common among both E. faecalis and E. faecium. In particular, E. faecalis showed almost no susceptibility to all the antimicrobials tested except penicillin and flavomycin, to which 1.4% and less than 24% showed resistance, respectively. Although the prevalence of resistance was lower than in E. faecalis, E. faecium showed relatively uniform resistance to all the agents tested. Among the antimicrobials tested, virginiamycin and penicillin were the most effective against E. faecium isolates: less than 31% and 41% showed resistance to those 2 antimicrobials, respectively. Penicillin was the only agent that showed relatively strong activity against both E. faecalis and E. faecium. Resistance observed in E. faecalis and E. faecium against most antimicrobials used for growth promotion was more prevalent in Korea than in European countries. The current study is the first report of resistance against feed additive antimicrobials in enterococcal isolates from livestock in Korea.
authors.affiliation: Bacteriology and Parasitology Division, National Veterinary Research and Quarantine Service, Anyang, Gyeonggi-Do, Republic of Korea.
authors.forename: In Yeong
authors.initials: IY
authors.lastname: Hwang
authors.forename: Hyun Ok
authors.initials: HO
authors.lastname: Ku
authors.forename: Suk Kyung
authors.initials: SK
authors.lastname: Lim
authors.forename: Choi Kyu
authors.initials: CK
authors.lastname: Park
authors.forename: Gab Su
authors.initials: GS
authors.lastname: Jung
authors.forename: Suk Chan
authors.initials: SC
authors.lastname: Jung
authors.forename: Hyang Mi
authors.initials: HM
authors.lastname: Nam
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002645:Chickens / Q000382:microbiology*; D016983:Enterococcus / Q000254:growth & development / Q000302:isolation & purification*; D013293:Enterococcus faecalis / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification; D016908:Gram-Positive Bacterial Infections / Q000188:drug therapy / Q000453:epidemiology / Q000662:veterinary*; D007113:Immunity, Innate; D007723:Korea / Q000453:epidemiology; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D011201:Poultry Diseases / Q000188:drug therapy / Q000453:epidemiology; D013045:Species Specificity; D013552:Swine / Q000382:microbiology*; D013553:Swine Diseases / Q000188:drug therapy / Q000453:epidemiology
chemical_list: D000900:Anti-Bacterial Agents