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An anomalous effect of allergen concentration on weal size elicited by skin testing for immediate hypersensitivity
Author(s) -
HUGGINS K. G.,
BROSTOFF J.
Publication year - 1979
Publication title -
clinical and experimental allergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 154
eISSN - 1365-2222
pISSN - 0954-7894
DOI - 10.1111/j.1365-2222.1979.tb01520.x
Subject(s) - allergen , serial dilution , immunology , allergy , skin test , immunoglobulin e , medicine , pollen , chemistry , biology , pathology , botany , antibody , tuberculosis , alternative medicine
Summary We report the finding of anomalous responses in the skin of atopic individuals when prick tested with serial dilutions of cocksfoot grass pollen extracts. Each pollen extract was standardized using RAST inhibition activity related to the WHO standard for IgE. 75% of the patients gave a larger weal area with an allergen concentration of 1:10 5 than with the next higher concentration, i.e. 1:10 4 . Possible mechanisms whereby a larger skin weal is elicited with a lower concentration of allergen are discussed. This is not a rare finding and can be observed in patients undergoing routine skin testing in the clinic, even where extracts are diluted over a relatively narrow concentration range.