November 4, 2021
UK Health Security Agency
“Executive Summary: … Based on antibody testing of blood donors, 98.0% of the adult population now have antibodies to COVID-19 from either infection or vaccination compared to 18.7% that have antibodies from infection alone…
Results: … In individuals aged greater than 30, the rate of a positive COVID-19 test is higher in vaccinated individuals compared to unvaccinated.”
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breakthrough cases,COVID-19,vaccines,clinical cases