The importance of achieving herd immunity to control covid-19

Herd immunity in a society is achieved naturally with 70% of the population infected.

Or, better yet, when discovering a vaccine against the virus, immunity is also guaranteed with 60% of those vaccinated.

That is the time when a substantial reduction in the transmission of the virus will be observed.

CNN contributor Dr. Elmer Huerta tells us that the key issue for immunity is how long we would be protected with the first vaccine application.