Frequency of occurrence of IgG (S-TS).

A group of eighty-four sera from a selected population of patients suspected of hypersensitivity to food and environmental allergens was examined by both RAST and passive transfer in monkeys for IgE and IgT (S-TS) antibodies respectively. A high proportion (26%) showed IgG (S-TS) to milk, and this was more than four times the frequency (6%) for IgG (S-TS) to any other of the antigens tested IgE and IgG (S-TS) antibodies behaved as independent biological systems.