US reaching herd immunity not likely

Doctor Anthony Fauci is warning that when the US does have a Covid vaccine, we still may not have full herd immunity.

Doctor Fauci says at this point, he would settle for a vaccine that is 70 to 75% effective.

But a recent poll says one third of Americans do not plan to have the Covid vaccine when available.

In an interview for the Aspen Institute Sunday, Dr. Fauci said the American public will need more education on the issue.

Three coronavirus vaccines are expected to be studied in large-scale clinical trials in the next three months.

Herd immunity comes when a sufficient proportion of a population is immune to an infectious disease.

That can be either through prior illness or vaccination, so that continued spread of disease is unlikely.