OK, but what is the control for acquired herd immunity and the end of the flu season? The PCR C19 test is not really definitive, so how the hell can you know that the vaccine is 90% effective?
Also - note the small sample size and fine print and unstated assumptions in the claim.
This is voodoo science at its best.
Whether the vaccine is effective or not should be proved with large impartial studies and not bandwagon jumping.
https://twitter.com/DailyMail/status/1376573328731869189