[Delayed skin reaction in a group of 400 hospital patients: control study (author's transl)]

Delayed hypersensitivity skin tests were carried out with 5 antigens - PPD, staphylococcus, streptokinase/streptodornase, candida and trichophytin-in 400 hospital patients without any known causes for diminished delayed hypersensitivity. The degree of reactivity to each antigen was: PPD. 69.50%; candida 49.75%; streptokinase/streptodornase 44.50%; trichophytin 42.00%; staphylococcus 14.25%. Reactivity to either PPD or candida occurred in 86.50% of all cases. Positive response to streptokinase/streptodornase was present in 7%; which brings the total cases with reactions to one or more of the 3 antigens to 93.50%. Those who responded to trichophytin or staphylococcus were 3% only, bringing the total response of all cases to at least one antigen, to 96.5%.