The dynamics of antimicrobial-resistant Campylobacter jejuni on Japanese broiler farms.
We investigated for dynamics of Campylobacter clones on 2 different managerial broiler farms. Campylobacter isolates were differentiated by resistance typing and molecular typing methods. On farm I, the same C. jejuni clones resistant to fluoroquinolone and oxytetracycline were isolated after one and half years again and another susceptible clone was invaded. The susceptible clone was isolated again after half year. Broiler flocks on the farm may be repeatedly infected with a few C. jejuni clones. On farm II, new clones including antimicrobial resistant one, were often invaded. The change of predominant C. jejuni clone in each flock on both the farms was observed, in the absence of antimicrobial selective pressure.
Ishihara
Kanako
K
National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan.
Yano
Sayoko
S
Nishimura
Maki
M
Asai
Tetsuo
T
Kojima
Akemi
A
Takahashi
Toshio
T
Tamura
Yutaka
Y
D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002169:Campylobacter Infections / Q000188:drug therapy / Q000382:microbiology / Q000662:veterinary*; D016123:Campylobacter jejuni / Q000187:drug effects*; D002645:Chickens; D015169:Colony Count, Microbial / Q000662:veterinary; D024881:Drug Resistance, Bacterial / Q000235:genetics; D024901:Drug Resistance, Multiple, Bacterial; D024841:Fluoroquinolones / Q000494:pharmacology; D007564:Japan; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D010118:Oxytetracycline / Q000494:pharmacology; D011201:Poultry Diseases / Q000188:drug therapy*
D000900:Anti-Bacterial Agents; D024841:Fluoroquinolones; D010118:Oxytetracycline