Reduced intradermal test dose of yellow fever vaccine induces protective immunity in individuals with egg allergy.

The neutralising antibody response after the yellow fever vaccine (YF-17D) skin test was measured in 7 egg allergic persons in whom further vaccination was abandoned because of a strong local urticarial reaction to the YF-17D vaccine test dose. We found that this test dose of 0.1mL of YF-17D vaccine was sufficient to induce a protective antibody response in all 7 subjects. Intradermal injection of 1/5th dose of the yellow fever vaccine appears to be sufficient, in non-allergic as well as allergic persons, and non-inferior to the subcutaneous full dose.