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In a Tuesday report, researchers from the Centers for Disease Control and Prevention estimated that three out of every four U.
Researchers examined blood samples from more than 200,000 Americans, looking for antiviral antibodies produced by the infection, not vaccines
The most dramatic increases are in children
About 34 percent of Americans of all ages had signs of infection in December
"I did expect an increase
The study found that older people were less likely to have a history of infection
Such tests can detect antibodies one to two years after infection, and possibly longer, Clark said
Studies have shown that previous infections can protect some people from serious illness and hospitalization, but CDC officials stressed that people who were previously infected should still get the COVID-19 vaccine
The study looked for any detectable antibody levels; it did not differentiate how many people had antibody levels that might be protective
Officials continue to urge Americans to get the vaccine and boosters, which provide everyone with additional protection against COVID-19, including those who have been previously infected
