inclusion criteria: * aged 6-17 years； * the subject and/or guardian can understand and voluntarily sign the informed consent form (double signature is required for 8-17 years old)； * reproductive women have a negative pregnancy test before each vaccination； * the subjects are able and willing to comply with the requirements of the clinical trial protocol, and can complete the study follow-up for approximately 13.5 months.

inclusion criteria: * aged 6-17 years； * the subject and/or guardian can understand and voluntarily sign the informed consent form (double signature is required for 8-17 years old)； * reproductive women have a negative pregnancy test before each vaccination； * the subjects are able and willing to comply with the requirements of the clinical trial protocol, and can complete the study follow-up for approximately 13.5 months.

inclusion criteria: - aged 6-17 years； - the subject and/or guardian can understand and voluntarily sign the informed consent form (double signature is required for 8-17 years old)； - reproductive women have a negative pregnancy test before each vaccination； - the subjects are able and willing to comply with the requirements of the clinical trial protocol, and can complete the study follow-up for approximately 13.5 months.

inclusion criteria: - aged 6-17 years； - the subject and/or guardian can understand and voluntarily sign the informed consent form (double signature is required for 8-17 years old)； - reproductive women have a negative pregnancy test before each vaccination； - the subjects are able and willing to comply with the requirements of the clinical trial protocol, and can complete the study follow-up for approximately 13.5 months.