psssst It's called a "clinical trial". Some get palcebo, some get strong cocktails; others, weaker. It is further a "double blind" trial, as the dcotors themselves are unaware of the type they are administering.

I’ve always suspected vaccines to have inconsistencies. Lord knows I’ve mixed enough mortar to know you’ll pretty much always get lumps of sand, portland, and lime in a batch of mud.

That said, I’m sure there were intended variances in the vax batches for both study, deaths and plausible deniability.