The White House on Friday unveiled plans for a new effort to ramp up testing for Covid-19, which experts say is an essential part of limiting the spread of the virus. This chart from Vox gives a sense of just how far the U.S. has to go to catch up to other countries that are dealing with the pandemic, including South Korea, the leading virus screener with 3,692 tests per million people. The U.S., by comparison, has done about 23 tests per million people as of March 12.

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