Immunogenicity and Safety of SYS6017 in the Participants Aged 40 Years and Above

Inclusion Criteria: * 1\. Individuals aged 40 years or older; * 2\. Able to understand the study procedures, comply with the protocol requirements to attend all the scheduled visits, voluntarily consent to participate in the study, and sign the informed consent form; * 3\. Is physically eligible at the discretion of investigators based on medical history inquiry and physical examination; For participants with chronic underlying diseases (e.g., diabetes mellitus, hypertension, hyperlipidemia and other chronic conditions), they may be enrolled if their conditions have been well controlled within 3 months prior to enrollment in this study (i.e., additional medical interventions or major adjustments to treatments are not required); * 4\. For female participants of childbearing potential: No sexual activity or effective contraceptive methods were used within one menstrual cycle before enrollment; No pregnancy plans and agree to adopt effective contraceptive methods within 8 months after enrollment. Exclusion Criteria: * 1\. History of zoster; * 2\. History of vaccination with varicella vaccine or zoster vaccine (including investigational vaccine); * 3\. Axillary temperature ≥ 37.1℃ on the day of enrollment or within 24 h before enrollment; * 4\. History of allergy to any component of the investigational vaccine; or history of severe allergic reactions to vaccines or medications (including but not limited to anaphylaxis, allergic laryngeal edema, Henoch-Schönlein purpura, thromb…