Abstract
Due to the pandemic caused by the new coronavirus （SARS-CoV-2）, the cumulative number of infected people was 447,873, and the cumulative number of deaths due to COVID-19, the infectious disease caused by SARS-CoV-2, reached about 9,000 in Japan as of March 14, 2021. The staff of Kindai University Hospital are treating patients with severe COVID-19. Due to this pandemic, Japan faced a collapse of the medical system, declared a state of emergency, and suffered socio-economic damage. Vaccinations will be started with priority given to medical staff and society is expected to return to normal, but there are some concerns about its limitations.
