title: The prevalence of Salmonella enteritidis and other Salmonella spp. among Canadian registered commercial layer flocks.
abstract: A survey was conducted to estimate the prevalence of Salmonella enteritidis and other salmonellas among Canadian commercial egg producing flocks. Environmental (faecal and eggbelt) samples from 152 of 295 (52.9%) randomly selected flocks were contaminated with salmonellas. Thirty-five different salmonella serovars were isolated. Eggbelt samples were more often contaminated with salmonellas than faecal samples (25.7 v. 10.1%). The most prevalent serovars were S. heidelberg, S. infantis, S. hadar, and S. schwarzengrund; they were isolated from samples of 59/295 (20%), 18/295 (6.1%), 17/295 (5.8%), and 15/295 (5.1%) flocks, respectively. Feed samples of 21/295 (7.2%) flocks were contaminated with salmonellas. Salmonella enteritidis was isolated from the environmental samples of 8/295 (2.7%) flocks. Salmonella enteritidis phage type (PT) 8 was isolated from 5 flocks, PT 13a from 2 flocks, and PT 13 from 1 flock.
authors.affiliation: Health of Animals Laboratory, Agriculture Canada, Guelph, Ontario.
authors.forename: C
authors.initials: C
authors.lastname: Poppe
authors.forename: R J
authors.initials: RJ
authors.lastname: Irwin
authors.forename: C M
authors.initials: CM
authors.lastname: Forsberg
authors.forename: R C
authors.initials: RC
authors.lastname: Clarke
authors.forename: J
authors.initials: J
authors.lastname: Oggel
mesh_terms: D000821:Animal Feed; D000818:Animals; D002170:Canada / Q000453:epidemiology; D002645:Chickens / Q000382:microbiology*; D005243:Feces / Q000382:microbiology; D005260:Female; D005516:Food Microbiology; D010957:Plasmids; D011201:Poultry Diseases / Q000453:epidemiology* / Q000382:microbiology; D015995:Prevalence; D012475:Salmonella / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D012481:Salmonella Infections, Animal / Q000453:epidemiology* / Q000382:microbiology; D012477:Salmonella enteritidis / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D012703:Serotyping