COVID vaccine prospects: former CDC director Dr. Tom Frieden is “guardedly optimistic”

Despite being upbeat about progress so far towards developing a COVID-19 vaccine, former CDC Director Dr. Tom Frieden warns that injecting millions of people who aren't sick with a substance that adversely affects even a small portion of the population could be catastrophic. Even an effective vaccine, in short, won't be a silver bullet. As much as the world would wish it to be true, there will not be a quick conclusion to this global catastrophe.