When an infectious disease broke out, it brought an unfamiliar virus. Therefore, when responding to the pandemic, we must not only "know the enemy", understand the structure and infection mechanism of the new coronavirus, but also "know ourselves" and understand how the human body's immune response and protection mechanisms work.

In accordance with these knowledge bases, a more scientific guidance for clinical diagnosis and treatment can be established, while potentially effective drugs can be screened. At present, drugs and therapies for the new coronavirus are emerging in an endless stream. Only by identifying the effect of drugs and relying on solid clinical trials can they truly obtain safe and efficacious clinical applications.