By CANDICE CHOI and ANIRUDDHA GHOSAL Associated Press 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 infection, to stop uncontrolled spread. Herd immunity doesn't make any one person immune, and outbreaks can still flare up. It means that a virus is no longer easily jumping from person to person, helping to protect those who are still vulnerable to catching it. […]
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