Health officials around the world are racing to vaccinate enough people to stop the spread of COVID-19, but what qualifies as “enough” is still an open question. The goal is to get to “herd immunity,” which is when enough people have immunity, either from vaccination or a past […]
Could exposure to the coronaviruses that cause the common cold help protect against COVID-19? Is herd immunity closer than previously thought? As nations lift lockdowns and experts worry about a potential second peak in cases, our ability to ward off infection is one of the hottest topics of […]
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