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The spleens of mice infected with Trypanosoma cruzi were tested for their contents of cells producing IgM, IgG1, IgG2a, IgG2b, and IgG3 specific for the trinitrophenyl hapten after immunization with trinitrophenyl-Ficoll and trinitrophenyl-bovine serum albumin at various times during the acute and chronic phases of the disease. Reduced splenic contents of all of these cells was the characteristic of the acute period, and a return to normal levels occurred during the chronic stage. However, the density of IgG2a- and IgG2b-producing plaque-forming cells in the spleen was not restored to normality until 130 days postinfection, i.e., long after the chronic phase had been attained, reflecting a diluting effect of splenomegaly on cells that produce immunoglobulin isotypes known to be cytotoxic for the blood form of the parasite.

Alterations in production of immunoglobulin classes and subclasses during experimental Trypanosoma cruzi infection