300萬到400萬只花了15天

There have been at least 4,005,414 cases of coronavirus in the United States since the start of the pandemic, and at least 143,820 people have died across the country, according to data compiled by Johns Hopkins University.

JHU recorded the first case of coronavirus in the United States on January 21:

It took the country 99 days to reach 1 million cases on April 28.
It then took 43 more days to reach 2 million cases on June 10.
It took another 28 days to surpass 3 million cases on July 8.
It has taken the United States only 15 additional days to surpass 4 million cases.

The US is the global leader in Covid-19 cases, followed by Brazil, India, Russia and South Africa: