Abstract
Groups of dogs raised free of helminths were monospecifically infected with the common nematodes Toxocara canis, Ancylostoma caninum and Trichuris vulpis. Serums from these dogs, and a group of dogs of unknown history but infected with Dirofilaria immitis and Dipylidium caninum, had levels of antibody to their homologous nematode antigens readily detectable by ELISA. No cross-reactions were apparent when these serums were tested by ELISA using oncosphere antigens of Taenia hydatigena, T. pisiformis and T. ovis, scolex excretory/secretory antigens of T. hydatigena, T. pisiformis and Echinococcus granulosus or protoscolex antigen of E. granulosus.
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