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2001 SEP 5 - (NewsRx.com & NewsRx.net) --
by N.R. Saltmarsh, staff medical writer - Children who are allergic to gelatin-based products may have delayed allergic reaction to Japanese encephalitis (JE) vaccine.
Although gelatin sensitivity was previously thought to account only for immediate-type reactions to JE vaccine (defined as within one hour), less was known about the source of non-immediate reactions, which include cutaneous signs emerging several hours or more after vaccination, noted M. Sakaguchi and colleagues at the National Institute for Infectious Diseases, Tokyo.
The researchers evaluated serum samples from 28 JE-vaccinated children who showed delayed allergic reactions such as urticaria, angioedema, and rash, and from 10 children who showed immediate allergic reactions.
All 10 children who showed immediate-type reactions had anti-gelatin IgE and IgG, and of 28 children with nonimmediate-type reactions, one had anti-gelatin IgE and nine (32%) had anti-gelatin IgG, reported Sakaguchi and coworkers. The child who had anti-gelatin IgE showed urticaria two hours after JE vaccination, they added ("Specific IgE and IgG to gelatin in children with systemic cutaneous reactions to Japanese encephalitis vaccines," Allergy, ...