Sorry, for the tardy reply. I missed your post. Here's a link to sources regarding the use of placebos and varied doses. The Covid shot rollout is part of an experimental trial, so placebos and dose variation is standard protocol. (Not that much standard protocol gets followed, in Covidland.) http://internetmatter.com/varying_dose_quantities_in_these.html
Sorry, for the tardy reply. I missed your post. Here's a link to sources regarding the use of placebos and varied doses. The Covid shot rollout is part of an experimental trial, so placebos and dose variation is standard protocol. (Not that much standard protocol gets followed, in Covidland.) http://internetmatter.com/varying_dose_quantities_in_these.html
Sorry, for the tardy reply. I missed your post. Here's a link to sources regarding the use of placebos and varied doses. The Covid shot rollout is part of an experimental trial, so placebos and dose variation is standard protocol. (Not that much standard protocol gets followed, in Covidland.) http://internetmatter.com/varying_dose_quantities_in_these.html