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The novel coronavirus (SARS-CoV-2, or 2019 nCoV) is an enveloped positive-sense single-stranded RNA virus. It has caused the novel coronavirus pneumonia (COVID-19) epidemic in humans. SARS-CoV-2 has a variety of structural proteins, including spike protein (S), envelope protein (E), membrane protein (M), and nucleocapsid protein (N). This antigen can usually be detected in upper respiratory tract samples during the acute phase of infection.
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