Preventing severe infection is a fine endpoint though. A vaccine or treatment that does that is a minimum viable tool for moving forward. Reduces deaths, reduc

Preventing severe infection is a fine endpoint though. A vaccine or treatment that does that is a minimum viable tool for moving forward. Reduces deaths, reduces utilization of medical resources, etc, and then when it's a vaccine, it's pretty likely that it also reduces transmission. But it doesn't need to reduce transmission to be worth an awful lot.