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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 case can, in principle, give rise to more than 3,000 cases six weeks later.

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