Herd Immunity

Daily COVID-19 vaccinations in Missouri have decreased by nearly 65% since reaching their high point in mid-April, and the slowing has doctors skeptical of whether the state can vaccinate enough people to stop the coronavirus from spreading.

Missouri has vaccinated 20% of the state’s population and expects a significant jump in the vaccine supply by summer — enough for all adults in the state to obtain a COVID-19 shot. But even if the federal government boosts the supply and every U.S. adult becomes eligible in May, widespread immunity could still take until 2022 to reach because a vaccine needs to be approved for children.