As in ...
If any vaccine trial (rally) is looking promising towards the end of this year, they will begin to manufacture millions of doses before they know for sure that it works, just to have them ready to go if they do.
"It isn't as if we're going to make the vaccine, show it's effective and then have to wait a year to rev up to millions and millions and millions of doses," Fauci said "That's going to be done as we're testing the vaccine."
Fauci added that while some people have severe cases of COVID-19,
most are able to recover from the virus, ...
which is an encouraging sign that a vaccine will work

.
"If the body is capable of making an immune response to clear the virus of natural infection, that's a pretty good proof of concept to say that you're going to make an immune response in response to a vaccine," he said.
Though he cautioned that there is "never a guarantee, ever, that you're going to get an effective vaccine."
Fauci has previously said that vaccines typically take at least 12 to 18 months to develop, but the COVID-19 vaccine trials have been sped up.