title: Serologic survey for Toxoplasma gondii in grizzly bears from Alaska.
abstract: Blood samples were collected from 892 grizzly bears (Ursus arctos) in Alaska (USA) from 1973 to 1987. Sera were tested for evidence of exposure to Toxoplasma gondii by means of the modified agglutination test. Two hundred twenty sera (25%) had titers > or = 25, the minimum threshold titer. Six hundred seventy-two sera (75%) had titers < 25. Antibody prevalence ranged from 9% (18 positive of 196 tested) in southern areas to 37% (162 of 433 tested) in northern areas. There was no readily apparent explanation for these discrepancies in location-specific prevalence.
authors.affiliation: Alaska Department of Fish and Game, Fairbanks 99701-1599, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Zarnke
authors.forename: J P
authors.initials: JP
authors.lastname: Dubey
authors.forename: O C
authors.initials: OC
authors.lastname: Kwok
authors.forename: J M
authors.initials: JM
authors.lastname: Ver Hoef
mesh_terms: D017677:Age Distribution; D000372:Agglutination Tests / Q000662:veterinary; D000413:Alaska / Q000453:epidemiology; D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood*; D005260:Female; D008297:Male; D015995:Prevalence; D011336:Probability; D017678:Sex Distribution; D014122:Toxoplasma / Q000276:immunology*; D014124:Toxoplasmosis, Animal / Q000453:epidemiology* / Q000276:immunology; D001503:Ursidae
chemical_list: D000913:Antibodies, Protozoan