Prevalence of Toxoplasma gondii infection in raccoons

J. P. Dubey From the Zoonotic Diseases Laboratory, Livestock and Poultry Sciences Institute, Agricultural Research Service, USDA, Rm 104, Bldg 1040, BARC-East, 10300 Baltimore Blvd, Beltsville, MD 20705-2350 (Dubey), Department of Pathobiology, School of Veterinary Medicine, New Bolton Center, University of Pennsylvania, Kennett Square, PA 19348 (Hamir), and Wistar Institute, Philadelphia, PA 19104-4268 (Hanlon, Rupprecht).

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A. N. Hamir From the Zoonotic Diseases Laboratory, Livestock and Poultry Sciences Institute, Agricultural Research Service, USDA, Rm 104, Bldg 1040, BARC-East, 10300 Baltimore Blvd, Beltsville, MD 20705-2350 (Dubey), Department of Pathobiology, School of Veterinary Medicine, New Bolton Center, University of Pennsylvania, Kennett Square, PA 19348 (Hamir), and Wistar Institute, Philadelphia, PA 19104-4268 (Hanlon, Rupprecht).

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C. A. Hanlon From the Zoonotic Diseases Laboratory, Livestock and Poultry Sciences Institute, Agricultural Research Service, USDA, Rm 104, Bldg 1040, BARC-East, 10300 Baltimore Blvd, Beltsville, MD 20705-2350 (Dubey), Department of Pathobiology, School of Veterinary Medicine, New Bolton Center, University of Pennsylvania, Kennett Square, PA 19348 (Hamir), and Wistar Institute, Philadelphia, PA 19104-4268 (Hanlon, Rupprecht).

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C. E. Rupprecht From the Zoonotic Diseases Laboratory, Livestock and Poultry Sciences Institute, Agricultural Research Service, USDA, Rm 104, Bldg 1040, BARC-East, 10300 Baltimore Blvd, Beltsville, MD 20705-2350 (Dubey), Department of Pathobiology, School of Veterinary Medicine, New Bolton Center, University of Pennsylvania, Kennett Square, PA 19348 (Hamir), and Wistar Institute, Philadelphia, PA 19104-4268 (Hanlon, Rupprecht).

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Summary:

Serum samples from 427 raccoons (93 from Pennsylvania, 45 from New Jersey, 72 from South Carolina, 68 from Virginia, 30 from Iowa, and 119 from Ohio) were evaluated for Toxoplasma gondii antibodies in dilutions of 1:25, 1:50, and 1:500. The distribution of T gondii antibody titers was < 1:25 for 212 raccoons (49.6%), 1:25 for 34 raccoons (7.9%), 1:50 for 117 raccoons (27.4%), and ≥ 1:500 for 64 raccoons (14.9%). Tissue cysts were seen in the liver, and tachyzoites were in the brain of a raccoon with abnormal neurologic signs and concurrent infection with canine distemper virus. Organisms in the liver were stained with anti-T gondii serum, and the raccoon had a T gondii titer of 1:160 in the agglutination test.

Summary:

Serum samples from 427 raccoons (93 from Pennsylvania, 45 from New Jersey, 72 from South Carolina, 68 from Virginia, 30 from Iowa, and 119 from Ohio) were evaluated for Toxoplasma gondii antibodies in dilutions of 1:25, 1:50, and 1:500. The distribution of T gondii antibody titers was < 1:25 for 212 raccoons (49.6%), 1:25 for 34 raccoons (7.9%), 1:50 for 117 raccoons (27.4%), and ≥ 1:500 for 64 raccoons (14.9%). Tissue cysts were seen in the liver, and tachyzoites were in the brain of a raccoon with abnormal neurologic signs and concurrent infection with canine distemper virus. Organisms in the liver were stained with anti-T gondii serum, and the raccoon had a T gondii titer of 1:160 in the agglutination test.

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