[baix777]

A recent study put the Pfizer vaccine at a 97% hospitalization prevention rate, which is much better than the AZ one. How comparable all these studies is a good question.

https://www.cidrap.umn.edu/news-perspective/2021/05/real-wor...

[maxerickson]

The US vaccines use a different spike protein than the AZ vaccine. It's likely that they are truly more effective.