[Ulrich2]

Unfortunately there is huge difference when it comes to the South African variant. AZ no longer works, but Pfizer does:

https://www.bbc.com/news/world-africa-55975052

vs.

https://www.sciencemag.org/news/2021/02/question-choices-pfi...

The 2nd key reason is that no other vaccine is backed up by so much real world data as BT because of Israel. That is the very topic of this thread. That is why I thought it is self-explanatory.