There are two big reasons the infection rate has reached this surprising level, according to the researchers.
An estimated 94% of people in the U.S. have been infected with the COVID-19 virus at least once, according toThe big reason for the surprising surge? The omicron variant’s record-shattering case rates early this year and middling booster rates that fell short of what experts had hoped to see.
A preprint of the paper, which has not yet been peer-reviewed, was published this week on a website called MedRxiv. The findings contain uncertainties because they are based on a statistical analysis of Centers for Disease Control and Prevention-reported diagnoses, hospitalizations and vaccinations, rather than antibody testing of a representative sample of Americans.
The researchers from Harvard, Yale and Stanford set out to understand how immunity to the virus had changed since December 2021. The calculations studied “the competing influences” of new vaccinations and infections and the waning of immunity earned from them.
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