Abstract
The frequency of HLA class I and II phenotypes was determined among 23 patients with positive gelatin IgE, eight of whom developed anaphylaxis, 18 patients who did not have gelatin IgE but who experienced non-immediate reactions after exposure to gelatin. HLA-DR9, which is unique to Orientals, was present in 56.5% of the gelatin IgE positive patients, as compared to control population frequency of 24% (P < 0.002). In the non-immediate reaction group, who did not generate IgE, phenotype distribution resembled controls. HLA-DR9 positive individuals have a relative risk of 4.1 for developing gelatin allergy with positive IgE.
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