D.C. Mayor Muriel Bowser. Photo: Marvin Joseph/The Washington Post via Getty Images

The District of Columbia is requiring visitors from high-risk areas on nonessential travel to self-isolate for 14 days, the city's health department announced last week.

What's new: The city released a list of 27 high-risk states on Monday, which will be updated every two weeks. California, Florida, Georgia, Arizona, Wisconsin and Texas are among those listed.

Between the lines: Workers considered essential are exempt from the order, which likely includes members of Congress. Maryland and Virginia are also currently exempt.

Go deeper: N.Y., N.J. and CT to require travelers from 31 states to quarantine

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Updated 10 hours ago - Health

World coronavirus updates

Data: The Center for Systems Science and Engineering at Johns Hopkins; Map: Axios Visuals

The number of COVID-19 cases surpassed 20 million worldwide on Monday evening, Johns Hopkins data shows.

The big picture: World Health Organization chief Tedros Adhanom Ghebreyesus told a virtual press conference as the world approached the milestone that 750,000 deaths were set to be recorded this week. "Behind these statistics is a great deal of pain and suffering. Every life lost matters," he said. "But I want to be clear: there are green shoots of hope and... it's never too late to turn the outbreak around."

Updated 13 hours ago - Health

5 states set single-day coronavirus case records last week

Data: Compiled by Axios; Map: Danielle Alberti/Axios

Five states set new highs last week for coronavirus infections recorded in a single day, according to the COVID Tracking Project and state health departments. Only one state — North Dakota — surpassed a record set the previous week.

Why it matters: This is the lowest number of states to see dramatic single-day increases since Axios began tracking weekly highs in June, and marks a continued decrease from late July.

15 hours ago - Health

At least 48 local public health leaders have quit or been fired during pandemic

Former California public health director Dr. Sonia Angell on Feb. 27 in Sacramento, California. Photo: Justin Sullivan/Getty Images

At least 48 local and state-level public health leaders have retired, resigned or been fired across 23 states since April, according to a review by the AP and Kaiser Health News.

Driving the news: California public health director Dr. Sonia Angell resigned on Sunday without explanation, a few days after the state fixed a delay in reporting coronavirus test results that had affected reopenings for schools and businesses, AP reports.