There is a belief commonly held by the public and by some physicians that the liquid content of the vesicles of dermatitis venenata due to poison ivy is capable of producing new lesions and may even cause an eruption to appear on other persons contaminated by the vesicle liquid. Based on our clinical impressions over a period of years, the principles taught in the outpatient department at the Jefferson Medical College have been contrary to this view. In 1937-1938 patch tests1 with various strengths of poison ivy extracts were performed on 223 young men. There were positive reactions to 156 patch tests on 101 men. Many of these reactions were vesicular. These men were advised not to apply lotions or otherwise treat the positive test sites or in any way prevent the vesicle contents from being casually transferred to other parts of the skin. In no
PRATT AG, CORSON EF. SPREAD OF DERMATITIS VENENATA BY VESICLE CONTENTS. Arch Derm Syphilol. 1945;51(5):316. doi:10.1001/archderm.1945.01510230026006
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