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R. G. Owen, M.D.; H. E. Cope, M.D.
JAMA. 1931;96(18):1527-1528. doi:10.1001/jama.1931.02720440075029.
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To the Editor:  —The statement in your editorial headed "The Standard and the Presumptive Kahn Reactions" (The Journal, February 14) reading "The superiority of the Kahn test over different Wassermann technics as well as other precipitation tests is shown by an analysis of the results obtained at the competitive serologic conference of the League of Nations Health Committee held at Copenhagen in 1928" is quite misleading. An analysis of the results of the conference actually shows that the Kahn test is superior in sensitivity to the type of complement fixation test in general use in Europe and nothing more. Of the seven complement fixation tests used at the conference, six employed a preliminary fixation of not over one hour at 37 C.; the other (Jacobsthal) used both 37 C. and "cold" fixation for one hour. It has long been recognized by competent American serologists that such types of preliminary fixation


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