According to real-world research and clinical trial data at home and abroad, combined with the actual vaccination situation in my country, the time interval between the second dose of booster immunization and the first dose of booster immunization is more than 6 months. Vaccination units should do a good job in the registration of vaccination information and vaccine flow management for enhanced immunization, and timely and accurately update the relevant content of vaccination records in the immunization planning information system and vaccination certificates.