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Rapid Decrease of Precipitating and Reaginic Antibodies in Dirofilaria Immitis-Infected Dogs Which Develop Severe Adverse Reactions Following Treatment with Diethylcarbamazine

Dirofilaria immitis-infected dogs were treated with diethylcarbamazine. Measurement of the level of IgG precipitating antibody was carried out by counterimmunoelectrophoresis and that of IgE by passive cutaneous anaphylaxis in pre-treatment and post-treatment serum samples. In dogs showing severe to moderate adverse reactions to the drug there were pronounced decreases of both antibodies to a "metabolic" antigen prepared from the medium in which adult female worms had been incubated. These antibody levels did not decline in non-reacting dogs. Precipitating antibody levels to somatic antigens extracted from adult worms and microfilariae remained unaltered in both reactive and non-reactive animals.

Accepted for publication June 10, 1978.