U.S. cases of the novel coronavirus topped 1 million on Tuesday, having doubled in 18 days, and making up one-third of all infections in the world, according to a Reuters tally.
More than 56,500 Americans have died of the highly contagious respiratory illness COVID-19 caused by the virus, an average of about 2,000 a day this month, according to the tally.
The actual number of cases is thought to be higher, with state public health officials cautioning that shortages of trained workers and materials have limited testing capacity.