Because the Delta variant spreads so easily, some believe that percentage for COVID-19 herd immunity is now closer to 80%, perhaps even as high as 90%.
WBZ-TV's Dr. Mallika Marshall has more.
Health Officials Doubling Down On Push To Vaccinate Against Delta Variant
CBS 13 Sacramento
A new study shows that the Delta variant of COVID-19 doubles the risk of hospitalization compared to the original virus. Now,..
