[Tolerance induction and production of anti-idiotypic antisera in carp].

Tolerance in carps can be induced by intracardial injection of 10-30 mg of ultracentrifuged human gamma globulin (HGGu), with strong individual variation being observable. Out of 21 carps pretreated with 10 mg HGGu, 10 animals showed 14 days after i.p. test immunization with 1 mg HGGu a log2 anti-HGG titre of 1.55 +/- 0.60 (control group - log2 7.33 +/- 1.47), while 11 animals exhibited a log2 titre of 7.45 +/- 2.75. Low doses of HGGu (0.01-1.0 mg) led to stimulation of immune response. If 1-2 mg of a human IgG myeloma protein are applied i.p. after intracardial injection of 10 mg HGGu either simultaneously or after a longer break, then a high-titre anti-idiotypical antiserum with low activity against HGG can be obtained in single cases. The experiments have shown wide individual variation in tolerance induction which may be due also to seasonal factors.