1This book presents the epidemiology, etiology, molecular biology, virology, and the latest research advances for COVID-19. It also presents the clinical manifestations, diagnosis and treatment of this new infectious disease. The content of this book is based on the literature review of several relevant articles published in China and abroad, as well as the experience of medical workers in this field in China. It has brought together experts in the Huashan Hospital Infectious Diseases Department who have long been at the forefront of clinical, basic infection and hospital infection control. In addition to all the literature consulted in China and abroad, we have also learned from Chinese medical workers from their field of work. After summarizing the experience, we aspire in this book to summarize as much as possible everything about COVID-19, from basic research to clinical prevention and treatment. This book is expected to be helpful to the large number of readers who are eager for the progress of COVID-19 research and treatment.