> For example, in the COVID-19 vaccine developed by the University of Oxford, the control group receives a meningitis and septicaemia vaccine as a placebo.
> The benefit of using an actual vaccine as the placebo control is that it will cause a similar reaction at the site of the injection as the COVID-19 vaccine, such as muscle pain and soreness. This prevents patients from knowing whether they are getting the placebo or the real treatment.
> The benefit of using an actual vaccine as the placebo control is that it will cause a similar reaction at the site of the injection as the COVID-19 vaccine, such as muscle pain and soreness. This prevents patients from knowing whether they are getting the placebo or the real treatment.
https://theconversation.com/coronavirus-vaccine-why-its-impo...