While China has seen a significant decline of COVID-19 cases after making all-out efforts for more than two months, the world is currently facing a surge in new cases and fatalities. To increase the understanding of China’s key measures on prevention and control of the COVID-19 outbreak in a comprehensive and objective manner, the Centre for International Knowledge on Development has developed a “100 Questions, 100 Answers” series. This Series focuses on widely discussed questions on COVID-19 that aim to facilitate a better understanding of China’s experience in responding to the health crisis. CIKD welcome comments, questions and further insights, which it will try to incorporate when adding new questions and updating answers. It is important to note that the information provided in this Series is intended for general knowledge and is not meant as a substitute for professional medical advice or treatment.