The results of this study indicate that although biologic false reactivity is usually transient, the time for resolution is variable. Allowing donors to give two or three BFR results before notification and deferral is one strategy that would substantially reduce the number of donors requiring deferral.

No abstract

In a former paper1 read before the Philadelphia County Medical Society May 28, 1913, it was conclusively shown by Thomas and Ivy in an analysis of over 200 cases in which monavalent, trivalent, hexavalent and a commercial antigen of twelve strains of gonococci were employed, that the gonococcus complement-fixation test possesses great specificity so far as positive results are concerned. The results have proved that "the different strains of the gonococcus differ markedly one from another \p=m-\so much so that the antibodies produced in the body by the toxin of one strain will in many instances not bind the complement in the presence of an antigen prepared from another strain. Therefore, if only one strain is used in the preparation of the