​Since it was first reported in Wuhan, China, in December 2019, communicable coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) continues to impose health and socioeconomic threats globally. SARS-CoV-2 belongs to the coronavirus family but is different from previous human coronaviruses (eg, SARS-CoV and Middle East respiratory syndrome CoV [MERS-CoV]) in that it results in disease progression that is difficult to predict and is varied. 1 SARS-CoV-2 has a receptor domain with high affinity toward angiotensin-converting enzyme 2 (ACE-2), which is abundant in many organs (Figure 1), thus explaining the varying symptoms and severity of COVID-19. 2, 3​