To achieve widespread immunity against COVID-19, we need a vaccine. Here, doctors explain how herd immunity works and how long it will take.
to try and figure out who may have already had COVID-19 and recovered, which may help guide public health decisions surrounding stay-at-home orders.
A new, preliminary pilot study from Massachusetts General Hospital found that nearly a third of 200 Boston residents who gave a drop of blood to researchers on the street tested positive for antibodies linked to COVID-19. The study found that none of the 64 people who had antibodies had tested positive for COVID-19 before, perBut a third of the population isn’t nearly enough, says Dr. Schaffner. He says it’s unlikely that this much of the general population would have antibodies to the virus.
“A vaccine would make us breathe a lot easier and would reduce the risk of COVID-19 infection very substantially,” Dr. Schaffner says. “At that point, we could all go back to normal activities without a care.” Until then, “the only thing we can do to keep the number of cases down is social distancing,” Dr. Adalja says, and those
as second and third waves of COVID-19 outbreaks hit after communities reach their initial peak in cases.from Harvard’s T.H. Chan School of Public Health projects that some level of social distancing could last until 2022, requiring certain measures to be in place between 25% and 75% of that time, depending on the seasons, “unless critical care capacity is increased substantially or a treatment or
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