Abstract
The interference of two simultaneous skin test reactions of intermediate strength has been studied in the guinea-pig, using four different antigens, i.e. ovalbumin, horse cytochrome c, PPD and oxazolone. Skin test reactions were evaluated at 4, 24 and 48 h by measuring three parameters: increase in skin thickness, diameter of erythema and intensity of erythema. When an Arthus reaction was elicited simultaneously with a delayed hypersensitivity (DH) reaction, no effect on the DH reaction was observed. When two simultaneous DH reactions were elicited with different antigens, the risk of interference appeared to be rather small. When, however, the same antigen was used for both skin tests, suppression of at least one parameter of a DH-reaction was found in almost all experiments. Suppression of one skin test by another one could not be reduced by introducing a large distance between the two skin tests. As complete inhibition of either of the parameters never occurred, multiple skin testing may allow one to obtain a qualitative impression of the state of delayed hypersensitivity; when, however, reliable quantitative data are needed, the performance of more than one skin test at a time should be avoided.
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Selected References
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