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Serum antibody levels in pigs infected with T. spiralis by ELISA with rTs-CLP. Pigs were infected per os with 20000 ML of T. spiralis, and sera were collected prior to infection and at 5, 10, 15, 20, 25, 30, 40, 50 and 60 days p.i. Serum samples obtained prior to infection were used as negative controls. rTs-CLP (A) or ES (B) was used as antigen.
