Abstract
Summary: Hemagglutination-inhibiting (HI) antibody responses to aqueous and emulsified mineral oil adjuvant influenza virus vaccines were compared at 15, 27 and 43 days after vaccination in mice exposed to daily x-irradiation (except Sundays) beginning 1 day before vaccination. At each bleeding HI levels induced by the adjuvant were higher in similarly irradiated mice than those induced by an aqueous vaccine containing the same amount of antigen. Moreover, HI responses in the irradiated mice injected with emulsified vaccine were equal or higher at each bleeding than those in mice injected with aqueous vaccine but not irradiated. The findings were interpreted as indicating that the adjuvant effect of emulsified vaccine was reduced, but not abolished, by repeated exposures to x-ray.

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