This clinical trial is to study protective efficacy and safety of a recombinant herpes zoster vaccine (LZ901) and sponsored by Beijing Luzhu Biotechnology Co., Ltd. It is a phase Ⅲ, randomized, double-blind, placebo-controlled in healthy people aged 40 years and older. The study is to protect adults against shingles (herpes zoster / varicella zoster virus(VZV)). There will be about 26000 participators who will receive two-dose injection at the upper arm.

LZ901 vaccine is made up of a tetramer of VZV glycoprotein E (VZV gE-Fc) and adsorbed with aluminum hydroxide adjuvant. This adjuvant can raise the immune response to a lot of antigens. It is the most widely used and safe adjuvant in various types of vaccines worldwide.

In this study:

1. The participation is voluntary.
2. Before the trial, participants will receive some tests for screening. If qualified, investigators will officially invite them to join this trial.
3. The trial vaccine is LZ901 (100μg/0.5 mL). The placebo, which is aluminum hydroxide adjuvant, has no active drug. Participants will receive one of two as above mentioned.
4. This trial included a protective efficacy test and a batch-to-batch consistency test (immunization subgroup). Approximately 26000 subjects aged 40 years and older will be enrolled. Subjects will be randomized to receive either LZ901 or placebo in which about 3000 subjects will be enrolled into immunization subgroup and randomly receive three different batches LZ901 and one batch placebo at a ratio of 1:1:1:3. The immunization subgroup was designed to evaluate the batch-batch immunogenicity consistency among three different batches of LZ901, as well as the immunogenicity and immunogenicity persistence of the LZ901 at 12, 24, and 36 months after full immunization.
5. All subjects will receive the LZ901 or Placebo on day 0 and day 29. Subject will have 16 visits, including 5 on-site visits and 11 in-person visits except for subjects in the immunization subgroup who have 24 visits, including 8 on-site visits and 16 in-line visits.
6. The primary objective was to evaluate the Vaccine Efficacy (VE) of LZ901 against herpes zoster, as compared with placebo, after 30 days of full immunization in people 40 years of age and older.
7. The secondary objective was to evaluate the protective efficacy of LZ901, as compared with placebo, against laboratory-confirmed cases of HZ after 30 days of full vaccination in people 40 years of age and older. To evaluate the safety of LZ901. The immunogenicity of LZ901was evaluated (immunization subgroup). To evaluate the batch-to-batch consistency of immunogenicity of three batches of LZ901 in subject aged ≥40 years (immunization subgroup).
8. An exploratory objective was to evaluate the effect of LZ901 on reducing the severity of PHN in HZ subjects ≥40 years old." To evaluate the efficacy of LZ901 compared with placebo in preventing PHN in subjects ≥40 years old with HZ efficacy endpoint. The immunogenicity of LZ901 was evaluated at 12, 24 and 36 months after full immunization in subject ≥40 years old (immunization subgroup).

Inclusion Criteria:

• Males and females able to provide legal identity certificate, aged ≥ 40 years inclusive at the time of signing the ICF;
• Able to understand the study procedures, voluntarily agree to participate in the study, and sign the ICF;
• Female subjects are not pregnant or lactating. Female subjects with childbearing potential should take reliable contraceptive measures, and have no pregnancy and fertility plan within 7 months;
• Axillary temperature ≤ 37.0℃ on the day of enrollment;
• Able to attend all scheduled follow-up visits and able to comply with protocol requirements;

Exclusion Criteria:

• Subjects who have had herpes zoster within the previous 5 years;

• Previous vaccination against varicella or shingles (including use of a registered product or participation in a clinical trial of varicella or shingles vaccine);

• Hypersensitivity to any of the components of the test vaccine: or prior hypersensitivity to any recombinant vaccine of CHO cell origin [e.g., recombinant hepatitis B vaccine (CHO cell)], polysorbate, etc.; or prior history of severe allergy* to any of the vaccinations;

  *Severe allergies: anaphylaxis, anaphylactic laryngeal edema, anaphylactic purpura, thrombocytopenic purpura, localized anaphylactic necrotic reaction (Arthus reaction), severe urticaria.

• Developed immunodeficiency diseases (congenital or acquired immunodeficiency diseases, human immunodeficiency virus infection) or received immunosuppressive/cytotoxic treatments (cancer chemotherapy, organ transplantation, or treatment planned during a clinical trial in the 6 months prior to vaccination);

• Receiving immunosuppressive therapy (e.g., long-term systemic glucocorticoid application for ≥14 days at a dose of ≥2 mg/kg/day or ≥20 mg/day of prednisone or prednisone-equivalent dose) within 3 months prior to vaccination or within 1 month after the planned full course of immunization；

• Received an inactivated or recombinant vaccine or mRNA vaccine within 14 days or any live attenuated vaccine within 28 days prior to vaccination;

• Subjects who are suffering from an acute illness or are in the acute exacerbation phase of a chronic disease within 3 days prior to vaccination;

• History of asplenia or functional asplenia, and asplenia or splenectomy due to any condition;

• Treatment with blood products or globulins within 3 months prior to enrollment, or planned use of such products within 2 months of vaccination;

• Participating in other clinical studies of investigational or un-registered products (drugs, vaccines or devices, etc.), or planning to participate in other clinical studies before the end of this clinical study;

• Significant underlying medical conditions that, in the opinion of the investigator, may prevent completion of the trial (e.g., life-threatening disease that may limit survival to less than 4 years) or any other condition