First case Jan 21, 2020: 99 days 1 million infected: 43 days later 2 million cases: 28 days later 3 million cases

The first reported case came on January 21. Within 99 days, 1 million Americans became infected.

It took just 43 days after that to reach 2 million cases.

And 28 days later, the US reached 3 million cases of the novel coronavirus Wednesday.

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• Record number: The US saw 60,021 new cases Tuesday