title: Seroprevalence of Lawsonia intracellularis in different swine populations in 3 provinces in Canada.
abstract: Porcine proliferative enteropathy caused by Lawsonia intracellularis is an important enteric disease in swine throughout the world. Information regarding the distribution of this pathogen in Canadian swine herds would be beneficial for the creation of control protocols. Pigs from Ontario, Quebec, and Alberta were tested by using an indirect immunofluorescence assay for antibodies to L. intracellularis. Pig seroprevalence was calculated as the proportion of pigs positive from total pigs tested in the targeted population. Seroprevalence (+/- standard error [s(x)]) in market hogs in Ontario from farrow-finish (FF) farms and finishing (FIN) farms were significantly different at 77% (s(x) = 7%) and 29% (s(x) = 15%), respectively. Seroprevalence for sows and gilts in FF and farrowing and nursery (FAR + NUR) farms in Ontario were 90% (s(x) = 3%) and 93% (s(x) = 6%), respectively. Seroprevalence in breeding females in Quebec from FF and FAR farms was 82% (s(x) = 5%) and 87% (s(x) = 3%), respectively. Seroprevalence (57%, s(x) = 8%) in finishing pigs in Alberta from FF farms was significantly different from that of multisite (MS) farms and FIN farms, 6% (s(x) = 6%) and 9% (s(x) = 5%), respectively. Lawsonia intracellularis appears to be widespread in Canada and the seroprevalence on FF farms is higher than that on FIN and MS farms, possibly due to the presence of breeding females or management differences.
authors.affiliation: Elanco Santé animale, 439, boul. du Séminaire Nord, 2e etage, St-Jean-sur-Richelieu, Québec J3B 5L4. paradis_marie_anne@lilly.com
authors.forename: Marie-Anne
authors.initials: MA
authors.lastname: Paradis
authors.forename: Marcelo
authors.initials: M
authors.lastname: Gottschalk
authors.forename: Andrijana
authors.initials: A
authors.lastname: Rajic
authors.forename: André
authors.initials: A
authors.lastname: Ravel
authors.forename: Jeff B
authors.initials: JB
authors.lastname: Wilson
authors.forename: Jeff
authors.initials: J
authors.lastname: Aramini
authors.forename: Carol A
authors.initials: CA
authors.lastname: McClure
authors.forename: C Paul
authors.initials: CP
authors.lastname: Dick
mesh_terms: D000416:Alberta / Q000453:epidemiology; D000822:Animal Husbandry / Q000379:methods; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood*; D045824:Desulfovibrionaceae Infections / Q000453:epidemiology / Q000662:veterinary*; D005260:Female; D019084:Fluorescent Antibody Technique, Indirect / Q000379:methods / Q000662:veterinary; D020639:Lawsonia Bacteria / Q000276:immunology*; D008297:Male; D009864:Ontario / Q000453:epidemiology; D011792:Quebec / Q000453:epidemiology; D016036:Seroepidemiologic Studies; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology*
chemical_list: D000907:Antibodies, Bacterial