The difference between primary and secondary protection is mainly reflected in the scope of application, protection requirements and other aspects. 1. Scope of application: the first level of protection applies to general respiratory fever outpatient emergency medical personnel, including close contact with patients with confirmed infectious diseases, infectious agents specimen transportation personnel. The second level of protection applies to the flow of patients with infectious diseases, disinfection of infected areas, specimen processing personnel, the transfer of patients with a confirmed diagnosis of medical care, isolation point of the work of medical and other personnel. 2. Protection requirements: primary protection needs to wear a white coat, disposable hat, disposable isolation suit, disposable gloves, disposable surgical mask. Secondary protection includes disposable hats, medical protective masks (N95), goggles, medical protective clothing, disposable gloves, and disposable shoe covers. Primary protection and secondary protection are designed to protect against various infection factors and reduce the occurrence of infection.