Vaccine efficacy is determined in randomised-control trials, in which volunteers receive either a vaccine or placebo. 'Efficacy of Vaccines Slightly Differ from One Trial to Another, It is Perfectly Normal'
Vaccine efficacy is determined in randomised-control trials, in which volunteers receive either a vaccine or placebo. 'Efficacy of Vaccines Slightly Differ from One Trial to Another, It is Perfectly Normal'
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