MSNBC The Rachel Maddow Show June 5, 2021 01:26:00
In other words, the laboratory data that indicate that if this is the level that you need, and you are up here, how long does it take for you to start going back down and getting below the protective level? that's called a correlative immunity. the other element you follow is if you start to see more breakthrough infections among people who are vaccinated. in other words, not as much protection as you were getting. whether that's going to be a year from now or 18 months, we don't know. but the one thing we are doing, rachel, we're taking it very seriously, and we're doing the clinical trials r...
Source: archive.org