Why the Vaccinated Are Still at Risk From Coronavirus

With Covid-19 shots reaching billions of people, reports have grown more common of people getting infected with the coronavirus despite being vaccinated. Just as a natural infection doesn’t guarantee protection from reinfection with the virus, neither does immunization provide a perfect shield. Still, those who have immunity — either from vaccination or infection — carry a fraction of the risk of those who have none. So-called breakthrough cases among the immunized are a reminder that as long

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