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November 1, 1919


JAMA. 1919;73(18):1382. doi:10.1001/jama.1919.02610440062032

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To the Editor:  —As additional evidence supporting Dr. Schamberg's desensitization of persons against ivy poisoning (The Journal, Oct. 18, 1919, p. 1213), the following experiment tried on myself may not be without interest: Ever since reaching college age and living in cities, I have been very susceptible to dermatitis by contact with poison ivy plants during country excursions, and once was confined to the house for two weeks.In 1910, before the outdoor season began, for about two months, twice a day, I took gradually increasing doses of tincture of rhus toxicodendron, starting with one drop and ending with a number now forgotten. I never had enough confidence in the possible immunization to come purposefully in contact with poison ivy, and previous experiences were too unpleasant to risk repeating, if avoidable. However, during that summer in portaging a canoe my bare arms unavoidably came in contact with much foliage of

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