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Suppression of specific IgM, IgA and IgG responses in mice treated with anti‐6 from birth

In contrast to previous studies, we report that heterologous anti‐δ antibodies can act as a powerful multi‐class humoral immunosuppressant. Primary direct plaque‐forming cell (IgM) responses of BALB/c mice injected from birth with a rabbit anti‐δ antiserum were reduced to 3% of control levels against a T‐dependent antigen (sheep red blood cells), and to 2% against a T‐independent antigen (dextran); IgA responses against 2 intraduodenal injections of cholera toxin were reduced to 7% of control levels. Other secondary immune responses of anti‐δ‐suppressed mice were suppressed to a lesser degree. IgM plaque responses generated by 2 injections of sheep red cells, for example, were reduced to 50% of control levels, with reduction of the corresponding IgG response to 42%.