Abstract
WORKING independently of each other, two agencies in 1931 simultaneously reported, on the very promising results which they obtained from the rapid whole blood test for S. pullorum when using a stained antigen. Coburn and Stafseth (1931) developed a stained antigen after the method of Huddleson and Abell for the rapid serum agglutination test for abortion in cattle. Schaffer, MacDonald, Hall, and Bunyea (1931) also announced the results with a similar, stained antigen developed by these investigators of the Bureau of Animal Industry, U.S.D.A. The method of preparing the stained antigen has been patented by the U.S.D.A. and permits to produce it commercially have been granted to manufacturers meeting the requirements stipulated by the Bureau of Animal Industry. It is, of course, important to know whether the stained antigens prepared by the various licensed laboratories are equally satisfactory. To obtain first-hand information on this point was one of the objectives .
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