We know a lot about making viral vaccines too so we have a lot of companies so a couple different methods get used and at least a few of them pan out. It's like

We know a lot about making viral vaccines too so we have a lot of companies so a couple different methods get used and at least a few of them pan out. It's like if we could have 20 companies try to build the same bridge without interfering with each other and whichever worked became real.