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To the Editor.—
Fry et al found decreased serum levels of IgM in four of 12 patients with dermatitis herpetiformis (Lancet 2:729-733,1967). As far as I know, this work has not been discredited. Yet, according to the answer to the Test Your Knowledge question in the Archives (110:252, 1974), one may not expect to find "decreased or undetermined serum levels of IgM" in dermatitis herpetiformis. When wrong answers are given, these quizzes really do "test your knowledge"!
Voron DA. Test Your Knowledge Quiz-Reply. Arch Dermatol. 1975;111(5):659. doi:10.1001/archderm.1975.01630170117030