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[–]Tom_Bombadil 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

It's a double blind study for vaccines vs a placebo. In vaccine studies the placebo is replaced with last year's vaccine, or another vaccine; never against a placebo.

It's always a study comparing the effects of two vaccines. There's is no placebo control.

Even cancer patients get placebos in experimental studies.