4,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000:1

I'm no mathematician, but that seems unlikely.

https://howbad.info/sweden.pdf

Pfizer batch codes appear to indicate toxicity

https://howbad.info/allnothing.html

TLDR; Declining toxicity over time shows control over/knowledge of the toxicity levels. Medical trials would do it this way in order to track results.