US National Library of Medicine
Medline Plus: Poison Ivy, Oak, Sumac
This encyclopedia article explores what an allergy to poison ivy, oak and sumac is. Content address precautions, symptoms, and first aid. Pictures are also provided.
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University of Iowa Health Care: Poison Ivy: The Most Common of Allergens
Article that covers the topic of poison ivy and includes details on identifying it, symptoms, misconceptions, treatment, and how to avoid it.