"It's become very difficult to measure prior infection in vaccine effectiveness studies. ![]() Increasing seroprevalence has also changed how vaccine effectiveness is measured. Immunity wanes over time, with the steepest declines among people without so-called "hybrid" immunity from both an infection and vaccination.Įxperts also now know that the risk posed by the virus to each person depends in part on their unique combination of previous vaccinations and infecting variants, the CDC told a panel of its outside vaccine advisers at a meeting late last month.Ībout 17% of COVID hospitalizations by the end of last year were from reinfections, according to a CDC study spanning data from 18 health departments. ![]() Having antibodies from a prior infection does not mean people are protected against catching COVID again. ![]() Just 54.9% of all adults currently think they have ever had COVID-19, according to Census Bureau survey results published by the CDC through mid-June.
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