Breakthrough COVID-19 cases are more common and severe in people with weakened immune systems, according to a new study.
Breakthrough infections are those that occur in vaccinated people.
COVID-19 Infections Among Vaccinated More Common, Severe in Immunocompromised: Study
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A COVID-19 vaccine is administered in Rosemead, Calif., on Nov. 29, 2021. Frederic J. Brown/AFP via Getty Images
By Zachary Stieber, Senior Reporter
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