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  • Title: Specific IgE and IgG to gelatin in children with systemic cutaneous reactions to Japanese encephalitis vaccines.
    Author: Sakaguchi M, Miyazawa H, Inouye S.
    Journal: Allergy; 2001 Jun; 56(6):536-9. PubMed ID: 11421899.
    Abstract:
    BACKGROUND: Systemic allergic reactions to Japanese encephalitis (JE) vaccine that include urticaria, angioedema, and rash have been reported. In Japan, children who suffered from allergic immediate-type reactions to JE vaccine had antigelatin IgE in their sera. However, the immunologic mechanism of allergic nonimmediate-type reactions that consist of cutaneous signs appearing several hours or more after JE vaccination has not been defined. METHODS: Serum samples were taken from 28 children who showed allergic nonimmediate-type cutaneous reactions to JE vaccine. Furthermore, serum samples were taken from 10 children who showed allergic immediate-type reactions with cutaneous signs and/or respiratory symptoms to JE vaccine. We have defined an immediate-type reaction as one occurring within 1 h after vaccination. RESULTS: Of 10 children who showed immediate-type reactions, all had antigelatin IgE and IgG. Of 28 children who showed systemic nonimmediate-type reactions, one had antigelatin IgE and nine (32%) had antigelatin IgG. The child who had antigelatin IgE showed urticaria 2 h after JE vaccination. CONCLUSION: These results suggest that some children who showed allergic nonimmediate-type reactions to JE vaccine were sensitized to gelatin.
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