自2019年12月，中國武漢爆發(fā)了新型冠狀病毒（SARS-CoV-2）導致的新型冠狀病毒肺炎（COVID-19），截至2020年2月26日，已導致累計78 190人確診感染，超過2 700人死亡，除中國外，亞洲、北美、歐洲、非洲等已有20多個國家發(fā)現(xiàn)新型冠狀病毒確診病例。中國疾病預防控制中心研究結果表明，無癥狀感染者的比例占1.2%，這些無癥狀傳染者在潛伏期很可能具有傳染性。確定SARS-CoV-2的起源和了解目前常見的檢測方法，將對戰(zhàn)勝這次疫情以及日后防范其卷土重來至關重要。

In December 2019, corona virus disease 2019 (COVID-19) outbreak caused by a new coronavirus, the 2019 novel coronavirus (SARS-CoV-2), began in Wuhan, China. As of february 26, 2020, SARS-CoV-2 has infected a total of 78 190 people and killed more than 2 700 people. Except China, Asia, Europe, North America, Africa, etc. Confirmed cases have been found in more than 20 countries. In addition, research data from the Chinese Center for Disease Control and Prevention showed that the proportion of asymptomatic new coronavirus infections accounted for about 1.2%. Besides, Asymptomatic infections are likely to remain infectious during the incubation periods. Conform the origin of SARS-CoV-2 and common detection methods will be vital for us to fight against this epidemic and to prevent a comeback of the new coronavirus in the future.

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