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A blood marker predicts who gets ‘breakthrough’ COVID
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A blood marker predicts who gets ‘breakthrough’ COVID

Smriti Mallapaty A worker at Sheba Medical Center in Israel prepares a dose of the Pfizer–BioNTech COVID-19 vaccine. Breakthrough cases among the center’s vaccinated healthcare workers were rare in the first months of 2021.Credit: Jack Guez/AFP via Getty People fully vaccinated against COVID-19 are less likely to become infected with the coronavirus if they have...