Wearing a mask is one of the important means to prevent respiratory infections such as pneumonia from novel coronavirus infections and is an important line of defense to protect people from respiratory infections. For the general population, such as the general public, public transportation drivers and passengers, cab drivers, sanitation workers, and service workers in public places, it is recommended that medical surgical masks be worn, and medical protective masks may be worn when available and under conditions that allow for their physical condition. For special populations, such as high-risk groups who may be exposed to suspected or confirmed cases, it is recommended in principle to wear medical protective masks (N95 and above) and supplies such as goggles, protective face screens, protective gloves and shoe covers.