Serum samples from 665 hunter killed black bears killed in 1989 to 1992 throughout Pennsylvania (USA) were tested for Toxoplasma gondii antibodies by the agglutination test in dilutions of 1:25, 1:50, and 1:500. Toxoplasma gondii antibodies were found in 535 of 665 (80%) bears. Considering the highest dilutions at which antibodies were detected, prevalences were 10% at 1:25, 37% at 1:50 and 33% at 1:500. No significant difference in antibody prevalence was found between males (79%) and females (80%), but a significant difference was found between juvenile (65%) and adult (83%) bears.
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1 October 1993
Prevalence of Toxoplasma gondii Infections in Pennsylvania Black Bears, Ursus americanus
Nancy Briscoe,
J. G. Humphreys,
J. P. Dubey
Journal of Wildlife Diseases
Vol. 29 • No. 4
October 1993
Vol. 29 • No. 4
October 1993
antibodies
black bear
prevalence
Toxoplasma gondii
toxoplasmosis
Ursus americanus