Inactivated vaccines and recombinant vaccines are not better than each other. Any vaccine that can be clinically applied to the human body has been strictly evaluated for its effectiveness and safety and can be clinically guaranteed. The difference between the two mainly lies in the principle of immune efficacy, and for the vaccinated population, there is a difference in the number of vaccinations, so it is recommended that vaccinators choose according to their needs or the type of vaccine available in the vaccination area. When the vaccine is injected into the body, it will cause the body to produce antibodies based on humoral immunity, thus helping to remove or neutralize the toxic side effects produced by viruses, bacteria and parasites, etc. and provide protection. Common inactivated vaccines include rabies vaccine, inactivated influenza vaccine, inactivated encephalitis B vaccine, and new inactivated coronavirus vaccine. The new inactivated coronavirus vaccine, for example, usually requires two inoculations within a specified period of time to provide better immunity. As the epidemic continues, some regions or key populations have now started to receive booster shots to better help prevent infection; 2. Recombinant vaccine: the full name is immune recombinant vaccine, which is mainly prepared in vitro directly by genetic engineering methods with antigenically active surface protein (for recognition of viruses), and then injected into the body to stimulate the body to produce an immune response. The common recombinant vaccines in China are recombinant hepatitis B vaccine and recombinant neocoronavirus vaccine. The recombinant neo-coronavirus vaccine, for example, requires three doses within a specified period of time to complete the immunization process, but no booster doses are currently recommended by the state for this vaccine.