Abstract
The first author to cite karaya gum as an allergen was Bullen.1 Later Feinberg2 and more recently Figley3 added 9 cases. During the past two years this atopen has been responsible for urticaria in 5 of my patients. One patient had, in addition, an obstinate attack of respiratory allergy. The following report of one of the 5 cases is representative of the clinical features and investigative difficulties involved. REPORT OF A CASE G. K. L., a woman aged 31, came to the clinic in December 1937 because she had suffered for eighteen months from periodic episodes of pruritus, urticaria and angioneurotic edema. At the onset of each attack there was severe pruritus, which became so distressing that sedatives and mechanical restraints were of no avail. Within a short period generalized urticaria developed, accompanied by a few lesions usually classified as angioneurotic edema. It is interesting to note

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