Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which was provisionally named as “coronavirus disease 2019” (COVID-19) by the International Committee on Taxonomy of Viruses,1 is a newly identified member of human coronavirus species that has emerged recently and caused a highly infectious disease. COVID-19 has spread aggressively across the globe since it was first reported in December 2019,2 and declared as a pandemic by the World Health Organization on March 11. Up to April 7, 2020, 1.33 million and 83,071 cases of COVID-19 have been confirmed worldwide and in China, respectively.
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