Millions of coronavirus cases likely went undiagnosed

As the U.S. reaches a toll of 500,000 lives lost to COVID-19, a new study suggests millions of infections last year went undiagnosed. The study's senior author, Kaitlyn Sadtler, an investigator at the National Institute of Biomedical Imaging and Bioengineering, joins CBSN to discuss what the findings mean for potential immunity.


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