The whole point of having a vaccine is to stimulate an immune response. Injecting attenuated flu virus without anything else does not work anywhere near as well as injecting flu virus with adjuvants - stuff specifically designed to help elicit an immune response. Usually oils.
More info:
http://www.whale.to/vaccine/adjuvants.html

Its grim showing so many sensitivities. The more I read about it, the more I am certain that I am sensitive to everything I enjoy. I admire your commitment to try the beige diet - I just can't face living on nothing but stuff I don't like.