This indication is based on immune response elicited by FLULAVAL, and there have been no controlled trials adequately demonstrating a decrease in influenza disease after vaccination with FLULAVAL. (1, 14)[1]
What this means is that the vaccine will generally give you the proper antibodies against the flu, but they have been unable to prove that it will decrease your risk of getting the flu. One should equal the other, but in medicine they have a greater burden of proof. In a trial, more people contracted the flu with the placebo than with the vaccine. Still they have not run the experiment to prove that you are less likely to get the flu or at least they have not put the experiment on the fold out.
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