placebo group:Inject 1 dose into the deltoid muscle of the upper arm according to the 0 and 1 month immunization schedule

Randomized, blinded, controlled design to evaluate the safety and tolerability of recombinant herpes zoster vaccine in healthy people aged 50-70 years, and a phase I clinical study to initially explore immunogenicity

Phase II clinical study evaluating the immunogenicity and safety of recombinant herpes zoster vaccine in healthy people aged 50-70 years with a randomized, double-blind, placebo-controlled design