The true number of Americans who've been infected with COVID-19 may top 20 million, according to new estimates from the CDC. "Our best estimate right now is that for every case that's reported, there actually are 10 other infections," CDC director Dr. Robert Redfield said on a call with reporters Thursday. The estimate comes from looking at blood samples across the country for the presence of antibodies to the virus. For every confirmed case of COVID-19, 10 more people had antibodies, Redfield said. Currently, there are 2.3 million COVID-19 cases reported in the U.S. The CDC's new estimate pushes the actual number of coronavirus cases up to at least 23 million.