Firstest with the mostest – What the world has learned about facing covid-19 | Briefing | The Economist
Some [cases of covid-19], such as that of a New York lawyer and his family, have no obvious connection to any of the four high-incidence countries, strongly suggesting that there are what epidemiologists call silent chains of transmission in the country. In a population without measures in place to control such chains, a single undiagnosed…