Development of Read-outs in Healthy, Hepatitis B Virus Naive Adults Vaccinated With the Hepatitis B Surface Antigen (HBsAg) in Combination With a GlaxoSmithKline (GSK) Biologicals' Adjuvant System

Study Overview
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Brief Summary
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This study aims to develop innovative immunological read-outs and new technologies in order to further characterise the early immune response and its kinetics as well as the adaptive immune responses to adjuvanted vaccines. This study will also evaluate the reactogenicity in healthy, hepatitis B virus naive adults vaccinated with the hepatitis B surface antigen in combination with a GSK Biologicals' Adjuvant System.

Detailed Description
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This study will be conducted in 2 steps with 2 study groups in each step. The entire study period for Step 1 is from Day -30 to Day 210 (240 days) The entire study period for Step 2 is from Day 0 to Day 180 for Group C and from Day 0 to Day 330 for Group D. Subjects will be blinded up to Day 60 in Step 1 and will be unblinded at the end of their Day 60 visit. Step 2 will be conducted in an open-label manner.

Official Title
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Development of Read-outs to Detect and Characterise the Early and Adaptive Immune Responses in Healthy, Hepatitis B Virus Naive Adults Vaccinated With the Hepatitis B Surface Antigen in Combination With a GSK Biologicals' Adjuvant System

Conditions
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Hepatitis B

Intervention / Treatment
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* Biological: Adjuvanted Hepatitis B surface antigen (HBsAg) candidate vaccine GSK2231392A.
* Biological: EngerixTM-B
* Biological: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subjects who, in the opinion of the investigator, can and will comply with the requirements of the protocol A male or female between, and including, 18 and 45 years of age at the time of first study product administration Written informed consent obtained from the subject Healthy subjects, in the opinion of the investigator, as established by medical history, clinical examination, and clinical laboratory assessment with no active disease that could interfere with the study endpoints, before entering into the study Body Mass Index (BMI) between 18.5 and 30 kg/m2 Female subjects of non-childbearing potential may be enrolled in the study - Non-childbearing potential is defined as pre-menarche, current tubal ligation, hysterectomy, ovariectomy or post-menopause. Female subjects of childbearing potential may be enrolled in the study, if the subject: has practiced adequate contraception for 30 days prior to first study product administration and has a negative pregnancy test on the day of placebo administration/ vaccination, and has agreed to continue adequate contraception during the entire treatment period and for 2 months after completion of the study. Exclusion Criteria: Known history of HBV infection. Previous vaccination against hepatitis B. Positive for anti-hepatitis B surface (HBs) antibodies, anti-hepatitis B core (HBc) antibodies, HBsAg, HCV antibodies and/or HIV. Any previous administration of vaccine components. Use of any investigational or non-registered product (drug or vaccine) other than the study vaccines within 30 days preceding the first study product administration, or planned use during the study period. No significant dietary restrictions or life-threatening food allergies. Regular use of non steroidal anti-inflammatory drugs within 1 month prior to first study product administration. Chronic administration (defined as more than 14 days in total) of immunosuppressants or other immune-modifying drugs within 6 months prior to the first study product administration.. Inhaled and topical steroids are allowed. Planned administration / administration of a vaccine not foreseen by the study protocol in the period starting 30 days before the first study product administration and during the entire study period (both Steps), with the exception of the influenza vaccine (pandemic or seasonal) which can be administered > 21 days preceding or > 21 days following each placebo/vaccine administration. Administration of immunoglobulins and/or any blood products within the last 3 months preceding the first study product administration or planned administration during the study period. Any confirmed or suspected immunosuppressive or immunodeficient condition, including HIV based on screening evaluations and on medical history and physical examination. History of or current bleeding or coagulation disorder. Any known or clinical signs of anaemia or any clinical condition (including vascular disorder) that would preclude frequent blood drawings. Poor venous access as assessed at screening by the investigator. Blood loss, including blood donation, of more than 300 mL within 90 days before the first study product administration. History of or current autoimmune or other immune-mediated disease. Any haematological or biochemical level out of normal range before entering into the study, as follows: Haemoglobin level < lower normal limit (LNL). Platelet counts out of normal range. Alanine aminotransferase [ALT] > upper normal limit (UNL). Aspartate aminotransferase [AST] > UNL. Creatinine > UNL. c-reactive protein [CRP] > UNL. Creatine phosphokinase [CPK] > UNL without any plausible explanation for this abnormality (such as sport activity). In case of haematological and/or biochemical value out of range for parameters mentioned here above, one re-testing of out of range value may be performed. Any acute or chronic, clinically significant disease, as determined by medical history, physical examination or laboratory screening tests. Known or suspected reaction or hypersensitivity likely to be exacerbated by any component of the vaccines. Acute disease and/or fever at the time of enrolment. Subjects with a minor illness (such as mild diarrhoea, mild upper respiratory infection) without fever may, be enrolled at the discretion of the investigator. Fever is defined as temperature ≥ 37.5°C for oral route. Pregnant or lactating female. Recent history of chronic alcohol consumption and/or drug abuse. Other conditions that the principal investigator judges may interfere with study findings.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 45 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: HBsAg/AS Group<br>Subjects in this group received 1 dose of Placebo at Day -30 followed by 2 doses of HBsAg/AS, at Day 0 and Day 30. | Biological: Adjuvanted Hepatitis B surface antigen (HBsAg) candidate vaccine GSK2231392A.<br>* Intramuscular vaccination in the deltoid region of the non-dominant arm according to protocol schedule.<br>* Other names: HBsAg/AS;Biological: Placebo<br>* Intramuscular vaccination in the deltoid region of the non-dominant arm according to protocol schedule.<br>|
| Active Comparator: Engerix-B Group<br>Subjects in this group received 1 dose of Placebo at Day -30 followed by 3 doses of Engerix-B at Day 0, Day 30 and Day 180. | Biological: EngerixTM-B<br>* Intramuscular vaccination in the deltoid region of the non-dominant arm according to protocol schedule.<br>* Other names: Engerix-B;Biological: Placebo<br>* Intramuscular vaccination in the deltoid region of the non-dominant arm according to protocol schedule.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Concentrations of Cytokines and Chemokines - Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | At Day -30 prior to placebo administration | 
| Cytokines and Chemokines Concentrations - Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -30 plus 1.5 Hours | 
| Concentrations of Cytokines and Chemokines in Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -30 plus 3 Hours | 
| Concentrations of Cytokines and Chemokines During Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -30 plus 6 Hours | 
| Concentrations of Cytokines/Chemokines - Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -30 plus 9 Hours | 
| Concentrations of Cytokines/Chemokines in Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -30 plus 12 Hours | 
| Concentrations of Cytokines/Chemokines During Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -30 plus 18 Hours | 
| Cytokines and Chemokines Concentrations in Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -29 | 
| Cytokines and Chemokines Concetrations During Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -28 | 
| Cytokines/Chemokines Concentrations in Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -27 | 
| Cytokines and Chemokines Concentrations During Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-placebo at Day -23 | 
| Concentrations of Cytokines and Chemokines - Study Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Pre-dose1 at Day 0 | 
| Concentrations of Cytokines and Chemokines in Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose1 at Day 0 plus 1.5 Hours | 
| Concentrations of Cytokines and Chemokines During Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose1 at Day 0 plus 6 Hours | 
| Cytokines and Chemokines Concentrations - Study Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose1 at Day 0 plus 12 Hours | 
| Cytokines and Chemokines Concentrations in Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose1 at Day 0 plus 18 Hours | 
| Cytokines and Chemokines Concentrations During Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose1 at Day 1 | 
| Cytokines/Chemokines Concentrations - Study Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose1 at Day 2 | 
| Cytokines/Chemokines Concentrations in Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose1 at Day 7 | 
| Cytokines/Chemokines Concentrations During Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose1 at Day 30 | 
| Plasma Concentrations of Cytokines and Chemokines - Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 30 plus 1.5 Hours | 
| Plasma Concentrations of Cytokines and Chemokines - Study Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 30 plus 3 Hours | 
| Plasma Concentrations of Cytokines and Chemokines in Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 30 plus 6 hours | 
| Plasma Concentrations of Cytokines and Chemokines During Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 30 plus 9 Hours | 
| Plasma Concentrations of Cytokines/Chemokines During Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 30 plus 12 Hours | 
| Plasma Concentrations of Cytokines/Chemokines - Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 30 plus 18 Hours | 
| Plasma Concentrations of Cytokines/Chemokines in Step 1 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 31 | 
| Concentrations of Plasma Cytokines and Chemokines - Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 32 | 
| Concentrations of Plasma Cytokines and Chemokines in Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 33 | 
| Concentrations of Plasma Cytokines and Chemokines During Step 1 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Post-dose 2 at Day 37 | 
| Concentrations of Cytokines and Chemokines - Step 2 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. | Pre-dose 1 at Day 0 | 
| Cytokines and Chemokines Concentrations - Step 2 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. The analysis was performed only on the HBsAg/AS_2 Group. | Post-dose 1 at Day 1 | 
| Concentrations of Cytokines and Chemokines During Step 2 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. The analysis was performed only on the HBsAg/AS_2 Group. | Post-dose 1 at Day 30 | 
| Concentrations of Cytokines and Chemokines in Step 2 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. The analysis was performed only on the HBsAg/AS_2 Group. | Post-dose2 at Day 30 plus 6 Hours | 
| Concentrations of Cytokines/Chemokines - Step 2 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. The analysis was performed only on the HBsAg/AS_2 Group. | Post-dose 2 at Day 31 | 
| Concentrations of Cytokines/Chemokines in Step 2 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. The analysis was performed only on the HBsAg/AS_2 Group. | Post-dose 2 at Day 37 | 
| Concentrations of Cytokines/Chemokines During Step 2 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. The analysis was performed only on the Engerix-B_2 Group. | Post-dose 2 at Day 180 | 
| Plasma Concentrations of Cytokines and Chemokines - Study Step 2 | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma.The analysis was performed only on theEngerix-B_2 Group. | Post-dose 3 at Day 180 plus 6 Hours | 
| Plasma Concentrations of Cytokines and Chemokines in Step 2 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. The analysis was performed only on the Engerix-B_2 Group. | Post-dose 3 at Day 181 | 
| Plasma Concentrations of Cytokines and Chemokines During Step 2 of Study | Cytokines and chemokines analysed were E-selectin, granulocyte macrophage colony-stimulating factor (GM-CSF), interferon-γ (IFN-γ), interleukin-10 (IL-10), IL-18, IL-2, IL-3, IL-4, IL-5, IL-6, IL-6r, IL-7, IL-8, IFN-γ-inducible protein (IP-10), monocyte chemoattractant protein-1 (MCP-1), MCP-2, MCP-4, monokine induced by IFN-γ (MIG), macrophage inflammatory protein-1 alpha (MIP-1 alpha), MIP-1 beta, MIP3-alpha, MPIF-1, tumor necrosis factor-alpha (TNF-alpha) and TNF-beta. Concentrations are presented as median, expressed in picogram/milliliter (pg/mL), as measured by Multiplex in plasma. The analysis was performed only on the Engerix-B_2 Group. | Post-dose 3 at Day 187 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Anti-Hepatitis B Surface (Anti-HBs) Antibody Concentrations in Serum - Step 1 | Anti-HBs antibody concentrations in serum were measured by Chemi Luminiscence Immuno Assay (CLIA). Concentrations were presented as geometric mean concentrations, in milli-International Units per milliliter (mIU/mL). | At Day 0 (PRE) and Day 60 (D60) post-vaccination | 
| Number of Subjects With Any and Grade 3 Solicited Local Symptoms - Step 1 | Assessed solicited local symptoms were pain, redness and swelling. Any = occurrence of the symptom regardless of intensity grade. Grade 3 pain = pain that prevented normal activity. Grade 3 redness/swelling = redness/swelling spreading beyond 100 millimeters (mm) of injection site. | During the 7-day (Days 0-6) post-placebo (PP) and post-vaccination period following each vaccine dose (D1 and D2) and across doses | 
| Number of Subjects With Any, Grade 3 and Related Solicited General Symptoms - Step 1 | Assessed solicited general symptoms were fatigue, gastrointestinal symptoms [nausea, vomiting, diarrhoea and /or abdominal pain], headache, malaise, myalgia, shivering and temperature [defined as oral temperature equal to or above (≥) 37.5 degrees Celsius (°C)]. Any = occurrence of the symptom regardless of intensity grade. Grade 3 symptom = symptom that prevented normal activity. Grade 3 fever = fever > 39.5 °C. Related = symptom assessed by the investigator as related to the vaccination | During the 7-day (Days 0-6) post-placebo (PP) and post-vaccination period following each vaccine dose (D1 and D2) and across doses | 
| Number of Subjects With Solicited Symptoms, as Assessed by the Investigator/Study Nurse - Step 1 | Assessed solicited symptoms were fever [defined as oral temperature equal to or above (≥) 37.5 degrees Celsius (°C)], pain, redness [spreading beyond 20 millimeters (mm) of injection site], induration [spreading beyond 20 millimeters (mm) of injection site], swelling [spreading beyond 20 millimeters (mm) of injection site] and muscle stiffness. | Up to 4 days post-placebo/vaccine administration. | 
| Number of Subjects With Any Unsolicited Adverse Events (AEs) - Step 1 | An unsolicited AE covers any untoward medical occurrence in a clinical investigation subject temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product and reported in addition to those solicited during the clinical study and any solicited symptom with onset out-side the specified period of follow-up for solicited symptoms. Any was defined as the occurrence of any unsolicited AE regardless of intensity grade or relation to vaccination. | Within the 28-day (Days 0-27) post-placebo (PP) and post-product administration period. | 
| Number of Subjects With Serious Adverse Events (SAEs) - Step 1 | Serious adverse events (SAEs) assessed include medical occurrences that result in death, are life threatening, require hospitalization or prolongation of hospitalization or result in disability/incapacity. | From Day 0 up to Day 60 for the HBsAg/AS_1 Group and from Day 0 up to Day 210 for the Engerix-B_1 Group | 
| Number of Subjects With Any Potential Immune-mediated Disorders (pIMDs) - Step 1 | PIMD(s) are a subset of AEs that include autoimmune diseases and other inflammatory and/or neurologic disorders of interest which may or may not have an autoimmune aetiology. | From Day 0 up to Day 60 for the HBsAg/AS_1 Group and from Day 0 up to Day 210 for the Engerix-B_1 Group | 
| Number of Subjects With Any New Medical Conditions Requiring Medical Attention (MAEs) - Step 1 | MAEs were defined as events for which the subject received medical attention defined as hospitalization, an emergency room visit, or a visit to or from medical personnel (medical doctor) for any reason. Any MAE(s) = Occurrence of any MAE(s) regardless of intensity grade or relation to vaccination. Analysis of intensity and relationship to vaccination of MAEs was not performed. | From Day 0 up to Day 60 for the HBsAg/AS_1 Group and from Day 0 up to Day 210 for the Engerix-B_1 Group | 
| Levels of Alanine Aminotransferase (ALT) in Blood Samples - Step 1 | Biochemical laboratory parameters assessed included ALT levels. ALT concentrations were expressed in units per liter (U/L). ALT levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Aspartate Aminotransferase (AST) in Blood Samples - Step 1 | Biochemical laboratory parameters assessed included AST levels. AST concentrations were expressed in units per liter (U/L). AST levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Basophils in Blood Samples - Step 1 | Haematological laboratory parameters assessed included basophil levels. Basophil levels were expressed in billion cells per liter (billion cells/L). Basophil levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Total Bilirubin in Blood Samples - Step 1 | Biochemical laboratory parameters assessed included total bilirubin levels. Bilirubin concentrations were expressed in milligrams per deciliter (mG/dL). Bilirubin levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Serum Creatinine in Blood Samples - Step 1 | Biochemical laboratory parameters assessed included creatinine levels. Creatinine concentrations were expressed in milligrams per deciliter (mg/dL). Creatinine levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Creatinine Phosphokinase (CPK) in Blood Samples - Step 1 | Biochemical laboratory parameters assessed included CPK levels. CPK concentrations were expressed in milligrams per deciliter (mg/dL). CPK levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of C-reactive Protein (CRP) in Blood Samples - Step 1 | Biochemical laboratory parameters assessed included CRP levels. CRP concentrations were expressed in milligrams per liter (mg/L). CRP levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Eosinophils in Blood Samples - Step 1 | Haematological laboratory parameters assessed included eosinophil levels. Eosinophil levels were expressed in billion cells per liter (billion cells/L). Eosinophil levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Haemoglobin in Blood Samples - Step 1 | Haematological laboratory parameters assessed included haemoglobin levels, expressed in grams per deciliter (g/dL). Haemoglobin levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Lactate Dehydrogenase (LDH) in Blood Samples - Step 1 | Biochemical laboratory parameters assessed included LDH levels, expressed in units per liter (U/L). LDH levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Lymphocytes in Blood Samples - Step 1 | Haematological laboratory parameters assessed included lymphocyte levels. Lymphocyte levels were expressed in billion cells per liter (billion cells/L). Lymphocyte levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Monocytes in Blood Samples - Step 1 | Haematological laboratory parameters assessed included monocyte levels. Monocyte levels were expressed in billion cells per liter (billion cells/L). Monocyte levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Neutrophils in Blood Samples - Step 1 | Haematological laboratory parameters assessed included neutrophil levels. Neutrophil levels were expressed in billion cells per liter (billion cells/L). Neutrophil levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Platelet Count in Blood Samples - Step 1 | Haematological laboratory parameters assessed included platelet count levels. Platelet count levels were expressed in billion cells per liter (billion cells/L). Platelet count levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Red Blood Cell (RBC) in Blood Samples - Step 1 | Haematological laboratory parameters assessed included red blood cells levels, expressed in trillion cells per liter (trillion cells/L). RBC levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Urea in Blood Samples - Step 1 | Biochemical laboratory parameters assessed included urea levels, expressed in miligrams per deciliter (mg/dL). Urea levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of White Blood Cells (WBC) - Step 1 | Haematological laboratory parameters assessed included WBC levels. WBC levels were expressed in billion cells per liter (billion cells/L). WBC levels were assessed at different time points (plus 6, 12 and 18 hours - H6, H12, H18) on Day 0 and Day 30. | At Day 0, Day 0 H6, Day 0 H12, Day 0 H18, Day 1, Day 7, Day 30, Day 30 H6, Day 30 H12, Day 30 H18, Day 31, Day 37 and Day 60 | 
| Levels of Diastolic Blood Pressure - Step 1 | Diastolic pressure was part of the list of vital signs followed at specific protocol-defined time points during this study, measured in millimeter of mercury (mmHg). On Days -30, 0 and 30, diastolic blood pressure was assessed at multiple time points (plus 1.5, 3, 6, 9, 12 and 18 hours - H1.5, H3, H6, H9, H12 and H18). | At Day -30, -30 (H1.5, H3, H6, H9, H12, H18) -29, - 28, - 27, -23, 0, 0 (H1.5, H6, H12 H18), 1, 2, 7, 30, 30 (H1.5, H3, H6, H9, H12, H18), 31, 32, 33, 37 and 60 | 
| Levels of Heart Rate - Step 1 | Heart rate was part of the list of vital signs followed at specific protocol-defined timepoints during this study. It was expressed in beats per minute. On Days -30, 0 and 30, heart rate was assessed at multiple time points (plus 1.5, 3, 6, 9, 12 and 18 hours - H1.5, H3, H6, H9, H12 and H18). | At Day -30, -30 (H1.5, H3, H6, H9, H12, H18) -29, - 28, - 27, -23, 0, 0 (H1.5, H6, H12 H18), 1, 2, 7, 30, 30 (H1.5, H3, H6, H9, H12, H18), 31, 32, 33, 37 and 60 | 
| Levels of Respiratory Rate - Step 1 | Respiratory Rate was part of the list of vital signs followed at specific protocol-defined timepoints during this study. It was expressed as breaths per minute (breaths/min). On Days -30, 0 and 30, respiratory rate was assessed at multiple time points (plus 1.5, 3, 6, 9, 12 and 18 hours - H1.5, H3, H6, H9, H12 and H18). | At Day -30, -30 (H1.5, H3, H6, H9, H12, H18) -29, - 28, - 27, -23, 0, 0 (H1.5, H6, H12 H18), 1, 2, 7, 30, 30 (H1.5, H3, H6, H9, H12, H18), 31, 32, 33, 37 and 60 | 
| Levels of Systolic Pressure - Step 1 | Systolic pressure was part of the list of vital signs followed at specific protocol-defined time points during this study, measured in millimeter of mercury (mmHg). On Days -30, 0 and 30, systolic pressure was assessed at multiple time points (plus 1.5, 3, 6, 9, 12 and 18 hours - H1.5, H3, H6, H9, H12 and H18). | At Day -30, -30 (H1.5, H3, H6, H9, H12, H18) -29, - 28, - 27, -23, 0, 0 (H1.5, H6, H12 H18), 1, 2, 7, 30, 30 (H1.5, H3, H6, H9, H12, H18), 31, 32, 33, 37 and 60 | 
| Anti-Hepatitis B Surface (Anti-HBs) Antibody Concentrations in Serum - Step 2 Immuno | Anti-HBs antibody concentrations in serum were measured by CLIA Assay. Concentrations were presented as geometric mean concentrations, in milli-International Units per milliliter (mIU/mL). | At Day 0 (PRE) and post-vaccination (Day 44 for HBsAg/AS_2 Group and Day 194 for Engerix-B_2 Group) | 
| Anti-Hepatitis B Surface (Anti-HBs) Antibody Concentrations in Serum - Step 2 Persistence | Anti-HBs antibody concentrations in serum were measured by CLIA Assay. Concentrations were presented as geometric mean concentrations, in milli-International Units per milliliter (mIU/mL). | At Day 0 (PRE) and post-vaccination (Day 44 for HBsAg/AS_2 Group and Day 194 for Engerix-B_2 Group) | 
| Number of Subjects With Any and Grade 3 Solicited Local Symptoms - Step 2 | Assessed solicited local symptoms were pain, redness and swelling. Any = occurrence of the symptom regardless of intensity grade. Grade 3 pain = pain that prevented normal activity. Grade 3 redness/swelling = redness/swelling spreading beyond 100 millimeters (mm) of injection site. | During the 7-day (Days 0-6) post-vaccination period following each vaccine dose and across doses | 
| Number of Subjects With Any and Grade 3 Solicited Local Symptoms - Pooling Step | Assessed solicited local symptoms were pain, redness and swelling. Any = occurrence of the symptom regardless of intensity grade. Grade 3 pain = pain that prevented normal activity. Grade 3 redness/swelling = redness/swelling spreading beyond 100 millimeters (mm) of injection site. | During the 7-day (Days 0-6) post-vaccination period following each vaccine dose and across doses | 
| Number of Subjects With Any, Grade 3 and Related Solicited General Symptoms - Step 2 | Assessed solicited general symptoms were fatigue, gastrointestinal symptoms [nausea, vomiting, diarrhoea and/or abdominal pain], headache, malaise, myalgia, shivering and temperature [defined as oral temperature equal to or above (≥) 37.5 degrees Celsius (°C)]. Any = occurrence of the symptom regardless of intensity grade. Grade 3 symptom = symptom that prevented normal activity. Grade 3 fever = fever > 39.5 °C. Related = symptom assessed by the investigator as related to the vaccination. At Day 0 of dose 2, two temperatures were collected: one at Hour 0 (H0) and a second one at Hour 18 (H18). The highest temperature between H0 et H18 was taken. | During the 7-day (Days 0-6) post-vaccination period following each vaccine dose and across doses | 
| Number of Subjects With Any, Grade 3 and Related Solicited General Symptoms - Pooling Step | Assessed solicited general symptoms were fatigue, gastrointestinal symptoms [nausea, vomiting, diarrhoea and/or abdominal pain], headache, malaise, myalgia, shivering and temperature [defined as oral temperature equal to or above (≥) 37.5 degrees Celsius (°C)]. Any = occurrence of the symptom regardless of intensity grade. Grade 3 symptom = symptom that prevented normal activity. Grade 3 fever = fever > 39.5 °C. Related = symptom assessed by the investigator as related to the vaccination. There was no pooling for temperature symptom between Step 1 and Step 2 due to difference in recording approach for the 18 hour data (nurse or self-assessment). | During the 7-day (Days 0-6) post-vaccination period following each vaccine dose and across doses | 
| Number of Subjects With Any Unsolicited Adverse Events (AEs) - Step 2 | An unsolicited AE covers any untoward medical occurrence in a clinical investigation subject temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product and reported in addition to those solicited during the clinical study and any solicited symptom with onset out-side the specified period of follow-up for solicited symptoms. Any was defined as the occurrence of any unsolicited AE regardless of intensity grade or relation to vaccination. | Within the 28-day (Days 0-27) and post-vaccination period | 
| Number of Subjects With Any Unsolicited Adverse Events (AEs) - Pooling Step | An unsolicited AE covers any untoward medical occurrence in a clinical investigation subject temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product and reported in addition to those solicited during the clinical study and any solicited symptom with onset out-side the specified period of follow-up for solicited symptoms. Any was defined as the occurrence of any unsolicited AE regardless of intensity grade or relation to vaccination. | Within the 28-day (Days 0-27) post-vaccination period. | 
| Number of Subjects With Serious Adverse Events (SAEs) - Step 2 | Serious adverse events (SAEs) assessed include medical occurrences that result in death, are life threatening, require hospitalization or prolongation of hospitalization or result in disability/incapacity. | Up to Day 180 for the HBsAg/AS_2 Group and up to Day 330 for the Engerix-B_2 Group | 
| Number of Subjects With Serious Adverse Events (SAEs) - Pooling Step | Serious adverse events (SAEs) assessed include medical occurrences that result in death, are life threatening, require hospitalization or prolongation of hospitalization or result in disability/incapacity. | Up to Day 180 for the HBsAg/AS_1+2 Group and up to Day 330 for the Engerix-B_1+2 Group | 
| Number of Subjects With Any Potential Immune-mediated Disorders (pIMDs) - Step 2 | PIMD(s) are a subset of AEs that include autoimmune diseases and other inflammatory and/or neurologic disorders of interest which may or may not have an autoimmune aetiology. | Up to Day 180 for the HBsAg/AS_2 Group and up to Day 330 for the Engerix-B_2 Group | 
| Number of Subjects With Any Potential Immune-mediated Disorders (pIMDs) - Pooling Step | PIMD(s) are a subset of AEs that include autoimmune diseases and other inflammatory and/or neurologic disorders of interest which may or may not have an autoimmune aetiology. | Up to Day 180 for the HBsAg/AS_1+2 Group and up to Day 330 for the Engerix-B_1+2 Group | 
| Number of Subjects With Any New Medical Conditions Requiring Medical Attention (MAEs) - Step 2 | MAEs were defined as events for which the subject received medical attention defined as hospitalization, an emergency room visit, or a visit to or from medical personnel (medical doctor) for any reason. Any MAE(s) = Occurrence of any MAE(s) regardless of intensity grade or relation to vaccination. | Up to Day 180 for the HBsAg/AS_2 Group and up to Day 330 for the Engerix-B_2 Group | 
| Number of Subjects With Any New Medical Conditions Requiring Medical Attention (MAEs) - Pooling Step | MAEs were defined as events for which the subject received medical attention defined as hospitalization, an emergency room visit, or a visit to or from medical personnel (medical doctor) for any reason. Any MAE(s) = Occurrence of any MAE(s) regardless of intensity grade or relation to vaccination. | Up to Day 180 for the HBsAg/AS_1+2 Group and up to Day 330 for the Engerix-B_1+2 Group | 
| Levels of Alanine Aminotransferase (ALT) in Blood Samples - Step 2 | Biochemical laboratory parameters assessed included ALT levels. ALT concentrations were expressed in units per liter (U/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of Aspartate Aminotransferase (AST) in Blood Samples - Step 2 | Biochemical laboratory parameters assessed included AST levels. AST concentrations were expressed in units per liter (U/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of Basophils in Blood Samples - Step 2 | Haematological laboratory parameters assessed included basophil levels. Basophil levels were expressed in billion cells per liter (billion cells/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of Serum C Reactive Protein (CRP) in Blood Samples - Step 2 | Biochemical laboratory parameters assessed included CRP levels. CRP concentrations were expressed in milligrams per liter (mg/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of Eosinophils in Blood Samples - Step 2 | Haematological laboratory parameters assessed included eosinophil levels. Eosinophil levels were expressed in billion cells per liter (billion cells/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of White Blood Cell (WBC) in Blood Samples - Step 2 | Haematological laboratory parameters assessed included white blood cells levels. WBC levels were expressed in billion cells per liter (billion cells/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of Lymphocytes in Blood Samples - Step 2 | Haematological laboratory parameters assessed included lymphocyte levels. Lymphocyte levels were expressed in billion cells per liter (billion cells/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of Monocytes in Blood Samples - Step 2 | Haematological laboratory parameters assessed included monocyte levels. Monocyte levels were expressed in billion cells per liter (billion cells/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of Neutrophils in Blood Samples - Step 2 | Haematological laboratory parameters assessed included neutrophil levels. Neutrophil levels were expressed in billion cells per liter (billion cells/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Platelet Count in Blood Samples - Step 2 | Haematological laboratory parameters assessed included platelet count levels. Platelet count levels were expressed in billion cells per liter (billion cells/L). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of Total Bilirubin in Blood Samples - Step 2 | Biochemical laboratory parameters assessed included total bilirubin levels. Bilirubin concentrations were expressed in milligrams per deciliter (mG/dL). | At Day 0 (PRE), Day 30, Day 32, Day 37, Day 60 for the HBsAg/AS_2 Group and Day 0 (PRE) Day 180, Day 182, Day 187 and Day 210 for the Engerix-B_2 Group | 
| Levels of Diastolic Blood Pressure - Step 2 | Diastolic pressure was part of the list of vital signs followed at specific protocol-defined time points during this study, measured in millimeter of mercury (mmHg). On Days 30 and 180, diastolic blood pressure was assessed at multiple time points (plus 0 and 6 hours - H0, H6). | At Day 0 (PRE), Day 30 (H0, H6) at Day 31, at Day 32, at Day 37, at Day 60 for the HBsAg/AS_2 Group and at Day 0 (PRE), Day 180 (H0, H6), Day 181, at Day 182, at Day 187 and at Day 210 for the Engerix-B_2 Group | 
| Levels of Heart Rate - Step 2 | Heart rate was part of the list of vital signs followed at specific protocol-defined time points during this study. It was expressed in beats per minute. On Days 30 and 180, heart rate was assessed at multiple time points (plus 0 and 6 hours - H0, H6). | At Day 0 (PRE), Day 30 (H0, H6) at Day 31, at Day 32, at Day 37, at Day 60 for the HBsAg/AS_2 Group and at Day 0 (PRE), Day 180 (H0, H6), Day 181, at Day 182, at Day 187 and at Day 210 for the Engerix-B_2 Group | 
| Levels of Respiratory Rate - Step 2 | Respiratory Rate was part of the list of vital signs followed at specific protocol-defined time points during this study. It was expressed as breaths per minute (breaths/min). On Days 30 and 180, respiratory rate was assessed at multiple time points (plus 0 and 6 hours - H0, H6). | At Day 0 (PRE), Day 30 (H0, H6) at Day 31, at Day 32, at Day 37, at Day 60 for the HBsAg/AS_2 Group and at Day 0 (PRE), Day 180 (H0, H6), Day 181, at Day 182, at Day 187 and at Day 210 for the Engerix-B_2 Group | 
| Levels of Systolic Pressure - Step 2 | Systolic pressure was part of the list of vital signs followed at specific protocol-defined time points during this study, measured in millimeter of mercury (mmHg). On Days 30 and 180, systolic pressure was assessed at multiple time points (plus 0 and 6 hours - H0, H6). | At Day 0 (PRE), Day 30 (H0, H6) at Day 31, at Day 32, at Day 37, at Day 60 for the HBsAg/AS_2 Group and at Day 0 (PRE), Day 180 (H0, H6), Day 181, at Day 182, at Day 187 and at Day 210 for the Engerix-B_2 Group | 
| -Frequency of Hepatitis B Virus (HBs)-Specific Cluster of Differentiation (CD)4+ T-cells Expressing at Least 2 Immune Markers - Step 1 | Markers expressed were Interleukin-2 (IL-2), Interferon gamma (IFN-γ), Tumor Necrosis Factor (TNF)-α and Cluster of differentiation 40-Ligand (CD40L), as measured by classical (qualified assay) Intracellular Cytokine Staining (ICS),using frozen Peripheral blood mononuclear cells (PBMCs). | At Day 0 prior to vaccination (PRE) and Day 44 post-vaccination | 
| Frequency of Hepatitis B Virus (HBs)-Specific Cluster of Differentiation (CD)4+ T-cells Expressing at Least 2 Immune Markers - Step 1 | Markers expressed were Interleukin-2 (IL-2), Interferon gamma (IFN-γ), Tumor Necrosis Factor (TNF)-α and Cluster of differentiation 40-Ligand (CD40L), as measured by classical (qualified assay) Intracellular Cytokine Staining (ICS),using frozen Peripheral blood mononuclear cells (PBMCs). | At Day 0 prior to vaccination (PRE), Day 44 and Day 180 post-vaccination | 
| Frequency of Hepatitis B Virus (HBs)-Specific Cluster of Differentiation (CD)8+ T-cells Expressing at Least 2 Immune Markers - Step 1 | Markers expressed were Interleukin-2 (IL-2), Interferon gamma (IFN-γ), Tumor Necrosis Factor (TNF)-α and Cluste of differentiation 40-Ligand (CD40L), as measured by classical (qualified assay) Intracellular Cytokine Staining (ICS),using frozen Peripheral blood mononuclear cells (PBMCs). | At Day 0 prior to vaccination (PRE) and Day 44 post-vaccination | 
| Frequency of Hepatitis B Virus (HBs)-Specific Cluster of Differentiation (CD)8+ T-cells Expressing at Least 2 Immune Markers - Step 1 | Markers expressed were Interleukin-2 (IL-2), Interferon gamma (IFN-γ), Tumor Necrosis Factor (TNF)-α and Cluster of differentiation 40-Ligand (CD40L), as measured by classical (qualified assay) Intracellular Cytokine Staining (ICS),using frozen Peripheral blood mononuclear cells (PBMCs). | At Day 0 prior to vaccination (PRE), Day 44 and Day 180 post-vaccination | 
| Number of Subjects With Solicited Symptoms, as Assessed by the Investigator/Study Nurse - Step 2 | Assessed solicited symptoms were fever [defined as oral temperature equal to or above (≥) 37.5 degrees Celsius (°C)], pain, redness [spreading beyond 20 millimeters (mm) of injection site], induration [spreading beyond 20 millimeters (mm) of injection site], swelling [spreading beyond 20 millimeters (mm) of injection site] and muscle stiffness. | Up to 3 days post-placebo/vaccine administration. | 
| Number of Subjects With Solicited Symptoms, as Assessed by the Investigator/Study Nurse - Pooling Step | Assessed solicited symptoms were fever [defined as oral temperature equal to or above (≥) 37.5 degrees Celsius (°C)], pain, redness [spreading beyond 20 millimeters (mm) of injection site], induration [spreading beyond 20 millimeters (mm) of injection site], swelling [spreading beyond 20 millimeters (mm) of injection site] and muscle stiffness. | Up to 3 days post-Dose 2 vaccine administration in HBsAg/AS_1+2 Group | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Adults, Reactogenicity, Naive, Immune responses, Read-outs, Hepatitis B, Healthy