Abstract

Abstract. The transfusion of blood with indetectable or only by electron microscope detectable amounts of HAA is presently as inevitable as the transfusion of blood containing no HAA at all, but nevertheless infective for hepatitis A or B. An unknown percentage of so‐called posttransfusion hepatitis cases is surely due to extrahaematogenic infections. In all these cases the manifestation of the disease seems to be due rather to a temporarily enhanced susceptibility of the patients than to the relatively small virus dose. The reported observations give support to the hypothesis that surgery or certain circumstances in close connection with surgery aside from the administration of blood may markedly enhance the susceptibility to hepatitis B manifestation.

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