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154 active trials for Atopic Dermatitis

Natural History and Genetics of Food Allergy and Related Conditions

Background: - About 15 million Americans have a food allergy. Because there are no cures or effective prevention or treatment for food allergies, researchers want to learn more about them. Objective: - To learn more about the causes and effects of food allergy and related conditions. Eligibility: People ages 2 99 who have food allergy and/or a related genetic or other condition Their relatives Healthy relatives and volunteers Design: Participants will have at least 3 visits over 1 2 years, and then once a year for up to 12 years. Each may last a day or longer. Participants will be screened with medical history, physical exam, and questionnaires. Participants may have the following: Blood tests Allergy skin prick tests: Drops of allergens are placed on the back or arm. The skin is scratched under each drop. Leukapheresis: blood is taken from a needle in one arm, passed through a machine, and returned through a needle in the other arm. X-rays Esophageal string test: One end of a string is taped to the cheek and the other end is packed into a capsule. When the capsule is swallowed, the string unwinds; it is left in for at least 1 hour. EGD and colonoscopy: Biopsies are taken from the gastrointestinal system. Tiny biopsies of skin Photographs of the body Collection of cells through: Swab of nose, inside of cheek, or skin Gentle skin scrape Tape stripping: piece of tape is put on the skin and pulled off.

Start: July 2015