Prophylaxis ofRhus toxicodendronDermatitis

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Abstract
EVALUATION of the results obtained by prophylactic inoculations of poison-ivy extract is made extremely difficult by factors that cannot be controlled. Some of the variables that impair the validity of conclusions are the following: fluctuation of a person's degree of sensitivity; inconstant environment; avoidance of poison ivy, whenever possible, by sensitive persons, minimizing and making unpredictable the incidence of contact; and spontaneous seasonal (and, lately, chemically induced) changes in vegetation. In addition, some studies depend on the results of patch tests or patients' statements that they have had poison-ivy dermatitis — neither entirely reliable bases for controlled work.1 A review . . .
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