COVID-19, the novel coronavirus disease caused by SARS-CoV-2 and outbroken at the end of 2019 in Wuhan, China, becomes a worldwide pandemic. SARS-CoV-2 belongs to the betacoronavirus genus and has 79.5% identity to SARS-CoV. SARS-CoV-2 uses angiotensin-converting enzyme 2 (ACE2) as its host entry receptor.
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