Coronavirus cases have dropped sharply in South Korea. What’s the secret to its success?

Europe is now the epicenter of the COVID-19 pandemic. Case counts and deaths are soaring in Italy, Spain, France, and Germany, and many countries have imposed lockdowns and closed borders. Meanwhile, the United States, hampered by a fiasco with delayed and faulty test kits, is just guessing at its COVID-19 burden, though experts believe it is on the same trajectory as countries in Europe.