Are the Vaccines Really a Wonder of Modern Medicine?

Six months after the first round of vaccines was released, Dr. Sanjay Gupta says they're still a wonder of modern medicon. If we could go back a year and a half and bring this vacion with us, give it to everybody in the world, we would have prevented millions of deaths, he says. "There's almost no vaccine on the planet that's going o prevent you from getting any infection"