CDC estimates 3 in 4 kids have had COVID

NEW YORK » Three out of every four U.S. children have been infected with the coronavirus and more than half of all Americans had signs of previous infections, Centers for Disease Control and Prevention researchers estimated in a report Tuesday.

The researchers examined blood samples from more than 200,000 Americans and looked for virusfighting antibodies made from infections, not vaccines. They found that signs of past infection rose dramatically between December and February, when the more contagious omicron variant surged through the U.S.

For Americans of all ages, about 34% had signs of prior infection in December. Just two months later, 58% did.

“I did expect it to increase. I did not expect it to increase quite this much,” said Dr. Kristie Clarke, coleader of a CDC team that tracks the extent of coronavirus infections.

The news came as Pfizer sought permission to offer a booster dose to kids ages 5 to 11, just like people 12 and older can get.

In the CDC report, the most striking increase was in children. The percentage of those 17 and under with antibodies rose from about 45% in December to about 75% in February.

The older people were, the less likely they had evidence of past infections. That may be because older adults have higher vaccination rates and they may be more likely to take other COVID-19 precautions, such as wearing masks and avoiding crowds, Clarke said.

Daily case counts have been trending up again in recent weeks.

Meanwhile the Biden’s administration is taking steps to expand the availability of the life-saving COVID-19 antiviral treatment Paxlovid, seeking to reassure doctors that there is ample supply for people at high risk of severe illness or death from the virus.