Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the strain of coronavirus that causes coronavirus disease 2019 (COVID-19), a respiratory illness. Colloquially known as coronavirus, it was previously referred to by its provisional name 2019 novel coronavirus (2019-nCoV). As described by the National Institutes of Health, it is the successor to SARS-CoV-1. SARS-CoV-2 is a positive-sense single-stranded RNA virus. It is contagious in humans, and the World Health Organization (WHO) has designated the ongoing pandemic of COVID-19 a Public Health Emergency of International Concern.
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