US hits more than 100M COVID-19 cases. Experts say this is likely an undercount

US hits more than 100M COVID-19 cases. Experts say this is likely an undercount On Thursday, the U.S. hit officially more than 100 million COVID-19 cases, but experts say this is likely an undercount of the true number of infections. ABC News ABC News

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"I think we know that a large majority of the population has already been infected with COVID," Brownstein said. "And so, this number only represents a fraction of all the cases. [The milestone] was very likely hit many months ago."

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