It is probably something in the vaccine other than the dead virus that they are allergic to. For example, some people who are allergic to eggs may be allergic to some types of vaccines (like the swine flu vaccine). Many vaccines are grown in chicken eggs, and there seems to be enough of the allergen from the eggs left in the final vaccine to cause a reaction.
People with egg allergy could have a reaction when given the flu vaccine because the vaccine may contain some amount of egg protein in it. The prevalence of egg allergy depends on age and history of allergic disease. It is estimated that egg allergy exists in 1.6 percent of children in the general population.
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