The Salk polio vaccine, for example, consists of an inactivated, dead virus. It was initially tested in over 600,000 children, a third of whom were given placebo, and was over 90% effective. As I'm sure you know, polio subsequently went from a devastating neurological illness with between 20-50,000 cases yearly in the U.S. to total elimination from the Americas. Sadly, outbreaks still occur in regions of the world that vaccination hasn't reached.
No announcement yet.