https://sebastianrushworth.com/2021/01/10/are-the-covid-vaccines-safe-and-effective/

Re: the Astra-Zeneca vaccine:

"The British and Brazilian arms were single-blind, while the South African arm was double-blind. ... This is strange, and really quite unforgivable, because it makes it much easier for the researchers to manipulate the results... There is no reason why a big, well-financed study like this shouldn’t use a double-blind methodology across all trial arms."

WTF.

Read the rest of the article, that's not even the only thing wrong with the trial.