COVID-19 vaccine might not get us the herd immunity we need, Dr. Fauci says

COVID-19 vaccine might not get us the herd immunity we need, Dr. Fauci says

Herd immunity: UC Irvine professor Andrew Noymer explains how it could contribute to slowing spread of coronavirus. “Herd immunity is the concept that once a certain proportion of the population is immune, the virus has a hard time bouncing from person to person.”