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		题名	作者	年代	出处	被引量
	1	Local Outbreak of COVID-19 in Shunyi District Attributed to an Asymptomatic Carrier with a History of Stay in Indonesia—Beijing Municipality,China,December 23,2020显示文摘Summary What is known about this topic?Patients with coronavirus disease 2019(COVID-19)infection can be categorized by severity:asymptomatic infection,mild illness,moderate illness,severe illness,and critical illness.The rate of transmission to a specific group of contacts(the secondary attack rate)may be 3-25 times lower from people who are asymptomatically infected than from those with symptoms.The incubation period is 2-14 days.	COVID-19 Epidemiology Investigation Team Laboratory Testing Team Wenzeng Zhang	2021	China CDC weekly2021，3，10：	9

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