On January 21 both South Korea and the US had 1 confirmed case of #COVID19. Since that day the outbreak followed very different trajectories.

[From our comparative perspective on the data on cases, deaths, and tests in Korea & the US http://ourworldindata.org/coronavirus?country=KOR+USA]
Per capita the rate of confirmed cases in the US is now more than 18-times higher than in South Korea.
The response to the early outbreak was very different:
• Korea started ramping up testing very soon.
• The US did not test much for a very long time.

[Same source http://ourworldindata.org/coronavirus?country=KOR+USA]
And the US never caught up with the success of Korea.

Since the outbreak in both countries Korea confirmed one case per 60.5 tests they have done. The US on the other hand found a case for each 6.6 tests.

[from our global COVID19 testing database: http://ourworldindata.org/coronavirus-testing]
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