This report has reviewed the clinical histories of 8 patients with chronic lymphocytic leukemia who manifested a marked delayed hypersensitivity type of local skin reaction to insect bites, and mosquito antigen and were capable of reacting normally to other delayed hypersensitivity antigens. We have suggested that this abnormality may represent another example of altered immunologic responsiveness in this disease, consistent with the notion that the lymphocyte is of prime importance for the development of delayed cutaneous hypersensitivity.

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