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  • Title: Serologic responses of cattle and other animals infected with Neospora caninum.
    Author: Dubey JP, Lindsay DS, Adams DS, Gay JM, Baszler TV, Blagburn BL, Thulliez P.
    Journal: Am J Vet Res; 1996 Mar; 57(3):329-36. PubMed ID: 8669764.
    Abstract:
    OBJECTIVE: To examine cross-reactivity among Neospora caninum and closely-related apicomplexans. DESIGN: Sera from animals were examined for antibody production to N caninum and cross-reactivity to Toxoplasma gondii. ANIMALS: Cattle were experimentally infected with 3 tissue cyst-forming protozoan parasites N caninum, T gondii, and Sarcocystis sp, and calves were monospecifically inoculated with the intestinal coccidia, Eimeria bovis and Cryptosporidium parvum. Similar studies were done in laboratory rabbits inoculated with N caninum, T gondii, Hammondia hammondi, and Sarcocystis sp. Additionally, sera were obtained from ewes, lambs, goats, sows, cats, rats, and mice inoculated with N caninum tachyzoites. PROCEDURE: The indirect fluorescent antibody (IFA) and ELISA antibody tests (cattle only) were used to examine reactivity to N caninum; the modified direct agglutination, Sabin-Feldman dye, and IFA tests were used to evaluate reactivity to T gondii. RESULTS: Serologic cross-reactivity among N caninum, T gondii, and Sarcocystis sp was none or minimal by the IFA test. There was some reactivity to N caninum by the use of ELISA in cattle inoculated with Sarcocystis sp. CONCLUSIONS: The IFA test for N caninum was specific for the diagnosis of neosporosis in animals.
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