“…Serum was collected from an adult male patient allergic to cod (Aas, 1966a, b), and was used for passive transfer tests and for adjustment ofthe RAST-technique modification to be used. This serum has been used as the reference serum in a number of studies previously reported (Aas, 1966a(Aas, , b, 1969Aas, Foucard & Johansson, 1971 ;Elsayed & Aas, 1971). It has been shown to be able in high dilutions to sensitize human skin in vivo and chopped human lung in vitro for challenges with cod extracts and DS 22, and to react in RAST coupled to Sephadex particles (Foucard et ai.. RAST with purified allergen from codfish 257 1973).…”