Herd Immunity February 19, 2021 11:11 pm When Can We Expect Herd Immunity? According to CDC numbers, in the last six weeks, daily COVID cases in the country have fallen by 78-percent. Could this drop have anything to do with herd immunity? US & World Videos 0:39 Police respond to incident in Whitinsville 2:39 American man awaits sentencing in Turks and Caicos ammo case 2:05 MIT monitors pair of opposing protests on campus 3:41 Cool air to linger over Boston into the weekend 2:28 Karen Read trial continues, jurors visit crime scene