title: Prevalence and antimicrobial susceptibility of Salmonella in Japanese broiler flocks.
abstract: This study determined the prevalence and antimicrobial susceptibility of Salmonella isolated from broiler flocks in Japan. Caecal dropping samples were collected from 288 broiler flocks between November 2007 and February 2010. Salmonella was prevalent in 248 (86·1%) broiler flocks. The top three serovars were S. Infantis, S. Manhattan and S. Schwarzengrund. S. Infantis was found in all regions tested in this study. However, S. Manhattan and S. Schwarzengrund were frequently found only in the western part of Japan. High antimicrobial resistance rates were observed against oxytetracycline (90·2%), dihydrostreptomycin (86·7%) and ampicillin (36·5%), and 258 (90·5%) of 285 isolates were resistant to two or more antimicrobial agents. Interestingly, 26·3% of isolates were resistant to ceftiofur, especially 38·1% of S. Infantis isolates, although its use in broilers has not been approved in Japan. This study showed that Salmonella is highly prevalent (86·1%) in Japanese broiler flocks, that 90·5% of Salmonella isolates were multidrug-resistant, and that S. Infantis frequently exhibited resistance to cephalosporin antimicrobial agents.
authors.affiliation: Food Safety and Consumer Affairs Bureau, Ministry of Agriculture, Forestry and Fisheries, Kasumigaseki, Chiyoda-ku, Tokyo, Japan. yoshimasa_sasaki@nm.maff.go.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Sasaki
authors.forename: A
authors.initials: A
authors.lastname: Ikeda
authors.forename: K
authors.initials: K
authors.lastname: Ishikawa
authors.forename: M
authors.initials: M
authors.lastname: Murakami
authors.forename: M
authors.initials: M
authors.lastname: Kusukawa
authors.forename: T
authors.initials: T
authors.lastname: Asai
authors.forename: Y
authors.initials: Y
authors.lastname: Yamada
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002511:Cephalosporins / Q000494:pharmacology; D002645:Chickens; D004096:Dihydrostreptomycin Sulfate / Q000494:pharmacology; D024881:Drug Resistance, Bacterial; D024901:Drug Resistance, Multiple, Bacterial; D005243:Feces / Q000382:microbiology; D007564:Japan / Q000453:epidemiology; D008826:Microbial Sensitivity Tests; D010118:Oxytetracycline / Q000494:pharmacology; D011201:Poultry Diseases / Q000453:epidemiology* / Q000382:microbiology; D012481:Salmonella Infections, Animal / Q000453:epidemiology* / Q000382:microbiology; D019779:Salmonella enterica / Q000187:drug effects* / Q000302:isolation & purification
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D000667:Ampicillin; C053503:ceftiofur; D004096:Dihydrostreptomycin Sulfate; D010118:Oxytetracycline