Health official says majority of Americans "remain susceptible" to COVID-19

WASHINGTON, Sept. 23 (Xinhua) -- Robert Redfield, director of the U.S. Centers for Disease Control and Prevention (CDC), said on Wednesday that a majority of Americans remain susceptible to COVID-19.

"CDC is in the process of a very large, sequential study across the entire United States, measuring serology," Redfield told the Senate Health Committee during a hearing. "The preliminary results on the first round show that a majority of our nation - more than 90% of the population - remains susceptible."