Abstract
Non-irritant concentrations of ragweed pollen extracts are those which produce significantly fewer positive skin reactions in control cases than in patients whose symptoms are attributable to ragweed pollen. Positive reactions produced by such extracts are presumptive evidence of sensitization to ragweed pollens (1, 2). The purpose of this investigation is to evaluate the significance of scratch test reactions produced by extracts of short and giant ragweed pollens purified according to our technic (3).
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