Quote:
Originally Posted by photon
They don't usually do a placebo trial for seasonal flu vaccines because they are well understood and have a long history to gather data from. This H1N1 vaccine is the same as a seasonal flu vaccine with the exception of the adjuvant, which has also been very well studied.
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If you look at the links I posted on the previous page, you can see that they do use placebo groups for studying flu vaccines.