The true number of Americans who’ve been infected with COVID-19 may top 20 million, according to new estimates from the Centers for Disease Control and Prevention.

“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…

“This virus causes so much asymptomatic infection,” Redfield said. “The traditional approach of looking for symptomatic illness and diagnosing it obviously underestimates the total amount of infections.”