On Friedberger's and Reis's reaction in typhus

In searching for evidence in favor of the etiological significance b. proteus vulgaris x19 typhus and on assumption that patients must be hypersensitive to this microbe, Prof. Friedberger together with Dr. Reis 1919 applied subcutaneous (and also intradermal) administration suspensions killed bacilli prot. x19. expected when certain doses suspension, which were completely indifferent healthy persons, administered, would react them same manner as, example, tuberculosis tuberculin injections.