Abstract

A primary immune response was obtained with suspensions of spleen cells in vitro and the polymer of Salmonella adelaide flagellin as antigen. This response is assayed by a technique which uses bacterial immunocytoadherence as a method of measuring the number of antibody-producing cells. The number of antibody-forming cells was shown to increase with time to a peak at 4 days and the system was antigen-dose dependent; the optimal amount being 0.002-0.02 μg, per ml. of culture fluid. Concentrations of 3 μg. per ml. of antigen caused specific unresponsiveness of cell-cultures, which, as critical tests indicated, was the induction of tolerance in vitro.

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