What we know about the outbreak
COVID-19 crossed an inflection point during the week of February 24, 2020. Cases outside China exceeded those within China for the first time, with 54 countries reporting cases as of February 29. The outbreak is most concentrated in four transmission complexes—China (centered in Hubei), East Asia (centered in South Korea and Japan), the Middle East (centered in Iran), and Western Europe (centered in Italy). In total, the most-affected countries represent nearly 40 percent of the global economy. The daily movements of people and the sheer number of personal connections within these transmission complexes make it unlikely that COVID-19 can be contained. And while the situation in China has stabilized with the implementation of extraordinary public-health measures, new cases are also rising elsewhere, including Latin America (Brazil), the United States (California, Oregon, and Washington), and Africa (Algeria and Nigeria). The US Centers for Disease Control and Prevention has set clear expectations that the United States will experience community transmission, and evidence is emerging that it may be happening already.
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