I think efficacy is usually defined as preventing symptoms, a higher bar than preventing hospitalizations. I believe most vaccines were extremely successful at

I think efficacy is usually defined as preventing symptoms, a higher bar than preventing hospitalizations. I believe most vaccines were extremely successful at preventing hospitalizations. Edit: Pfizer's primary endpoint was efficacy against lab-confirmed Covid-19 [1]. [1]: https://www.nejm.org/doi/full/10.1056/nejmoa2034577 https://www.nejm.org/doi/full/10.1056/nejmoa2034577