This needs to stop being sensationalized. Vaccine studies target something simple and easy to measure... whether it prevents Covid symptoms. That’s the hypothes

This needs to stop being sensationalized. Vaccine studies target something simple and easy to measure... whether it prevents Covid symptoms. That’s the hypothesis being tested. It is very likely that it also builds up your immune system to fight the virus such that you don’t spread it. But testing that hypothesis is very hard and not practical. He’s not saying you will spread it, just that strictly speaking, the trials didn’t test for that. We’ll have a better sense of it once the vaccine is widely used though.