title: High prevalence of viable Toxoplasma gondii infection in market weight pigs from a farm in Massachusetts.
abstract: The ingestion of uncooked infected meat is considered important in the epidemiology of Toxoplasma gondii infection in humans and little is known of the prevalence of viable T. gondii in meat used for human consumption in the United States. In the present study, viable T. gondii was isolated from 51 out of 55 pigs destined for human consumption. Hearts and tongues (500 g) from fifty-five 6-mo-old pigs from a farm in Massachusetts were bioassayed for T. gondii by feeding them to T. gondii-free cats. Feces of these cats were examined for shedding of T. gondii oocysts. Fifty-one of 55 cats fed pig tissues each shed 25-810 million T. gondii oocysts in their feces. Two of these cats consumed tissues of pigs that were shown to be seronegative with the Sabin-Feldman dye test, the modified agglutination test, and the Western blot. Results indicate that until examination of meat for T. gondii infection is implemented in slaughterhouses, all meat should be cooked according to industry guidelines before human consumption.
authors.affiliation: Parasite Biology, Epidemiology and Systematics Laboratory, Agricultural Research Service, United States Department of Agriculture, Beltsville Agricultural Research Center-East, Beltsville, Maryland 20705, USA. jdubey@anri.barc.usda.gov
authors.forename: J P
authors.initials: JP
authors.lastname: Dubey
authors.forename: H R
authors.initials: HR
authors.lastname: Gamble
authors.forename: D
authors.initials: D
authors.lastname: Hill
authors.forename: C
authors.initials: C
authors.lastname: Sreekumar
authors.forename: S
authors.initials: S
authors.lastname: Romand
authors.forename: P
authors.initials: P
authors.lastname: Thuilliez
mesh_terms: D000372:Agglutination Tests / Q000662:veterinary; D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood; D015153:Blotting, Western / Q000662:veterinary; D001921:Brain / Q000469:parasitology; D002415:Cats; D005243:Feces / Q000469:parasitology; D005260:Female; D006321:Heart / Q000469:parasitology; D008198:Lymph Nodes / Q000469:parasitology; D008297:Male; D008404:Massachusetts / Q000453:epidemiology; D008643:Mesentery; D051379:Mice; D015995:Prevalence; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology* / Q000469:parasitology; D014059:Tongue / Q000469:parasitology; D014122:Toxoplasma / Q000276:immunology / Q000302:isolation & purification; D014124:Toxoplasmosis, Animal / Q000453:epidemiology* / Q000469:parasitology
chemical_list: D000913:Antibodies, Protozoan