[Basis of coronavirus infection, and SARS-CoV-2].

At the end of December 2019, novel pneumonia emerged in Wuhan city, China, and it caused by novel coronavirus. Causative virus designated as Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2), and the diseases name was Coronavirus Disease 2019 (COVID-19). At first, SARS-CoV-2 was regarded as kind of SARS-CoV and Middle East Respiratory Syndrome coronavirus (MERS-CoV). However, it was misunderstanding and SARS-CoV-2 was similar to human coronaviruses. Here, to help better understanding for SARS-CoV-2, the basis of coronavirus infection was described.