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U.S. surpasses 10 million coronavirus cases; experts warn country is entering worst phase

Creating a new vaccine can involve thousands of people over several years. Here's what it takes to produce a new FDA-approved vaccine. (Video: The Washington Post)
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The United States surpassed 10 million coronavirus cases Monday, just 10 days after hitting 9 million. For the fifth consecutive day, the country has reported more than 100,000 infections, and public health experts warn that the country is entering the pandemic’s worst phase. At least 237,000 Americans have died of the coronavirus since February.

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The milestone came as Pfizer announced its coronavirus vaccine candidate was more than 90 percent effective, which sharply increased prospects that federal regulators will authorize the vaccine on an emergency basis as early as mid-December, and that the first shots will be administered before the end of the year or early next year.

Here are some significant developments:

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