Study of Purified Vero Rabies Vaccine Compared With a Reference Rabies Vaccine as Simulated Rabies Post-Exposure Prophylaxis in Adults in Thaïland

Study Overview
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Brief Summary
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Primary Objective: To describe the immune response induced by VRVg-2 and Verorab vaccines at D14 and D35 when co-administered with Human Rabies Immunoglobulins (HRIG) at D0, according to the Zagreb (2-1-1) IM regimen in healthy adult subjects. Secondary Objective: Immunogenicity To describe the immune response induced by VRVg-2 and Verorab vaccines at D90 when co-administered with HRIG at D0, according to the Zagreb (2-1-1) IM regimen in healthy adult subjects. Safety To describe the safety profile of VRVg-2 and Verorab vaccines when co administered with HRIG at D0, after each vaccination.

Detailed Description
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The duration of each subject's participation in the study will be approximately 7 months (21 day-vaccination period followed by 6 months safety follow-up period).

Official Title
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Immunogenicity and Safety of the Purified Vero Rabies Vaccine - Serum Free (VRVg) Using the Zagreb Regimen as Simulated Rabies Post-exposure Prophylaxis in Healthy Adults in Thailand

Conditions
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Rabies (Healthy Volunteers)

Intervention / Treatment
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* Biological: Purified vero rabies vaccine - serum free
* Biological: Purified inactivated rabies vaccine
* Biological: Human rabies immunoglobulins


Participation Criteria
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Eligibility Criteria
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Inclusion criteria : Aged ≥ 18 years on the day of inclusion Able to attend all scheduled visits and to comply with all study procedures Body Mass Index (BMI): 18.5 kg/m2 ≤ BMI ≤ 30 kg/m2s Exclusion criteria: Subject is pregnant, or lactating, or of childbearing potential and not using an effective method of contraception or abstinence from at least 4 weeks prior to the first vaccination and 1 month after each vaccination. To be considered of non-childbearing potential, a female must be pre-menarche or post-menopausal for at least 1 year, or surgically sterile. Participation at the time of study enrollment or, planned participation during the present study period in another clinical study investigating a vaccine, drug, medical device, or medical procedure Receipt of any vaccine in the 4 weeks (28 days) preceding the first study vaccination or planned receipt of any vaccine prior to Visit 7 (D90) Previous vaccination against rabies (in pre- or post-exposure regimen) with either the study vaccines or another vaccine Bite by, or exposure to a potentially rabid animal in the previous 6 months without post-exposure prophylaxis Receipt of immune globulins, blood or blood-derived products in the past 3 months Known or suspected congenital or acquired immunodeficiency; or receipt of immunosuppressive therapy, such as anti-cancer chemotherapy or radiation therapy, within the preceding 6 months; or long-term systemic corticosteroid therapy (prednisone or equivalent for more than 2 consecutive weeks within the past 3 months) At high risk for rabies exposure Known systemic hypersensitivity to any of the study/control vaccine components or to human rabies immunoglobulin (HRIG), or history of a life-threatening reaction to the vaccines used in the study or to a vaccine containing any of the same substances Self-reported thrombocytopenia, contraindicating intramuscular (IM) vaccination Bleeding disorder, or receipt of anticoagulants in the 3 weeks preceding inclusion, contraindicating IM vaccination Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily Current alcohol or substance abuse that, in the opinion of the Investigator, might interfere with the study conduct or completion Chronic illness that, in the opinion of the Investigator, is at a stage where it might interfere with study conduct or completion Moderate or severe acute illness/infection (according to Investigator judgment) on the day of vaccination or febrile illness (temperature ≥ 38.0 C). A prospective subject should not be included in the study until the condition has resolved or the febrile event has subsided Personal history of Guillain-Barré syndrome Identified as an Investigator or employee of the Investigator or study center with direct involvement in the proposed study, or identified as an immediate family member (ie, parent, spouse, natural or adopted child) of the Investigator or employee with direct involvement in the proposed study Receipt of chloroquine or hydroxychloroquine up to 2 months prior to the study or through to study until Visit 7 The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.

Ages Eligible for Study
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Minimum Age: 18 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: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Group 1: VRVg-2 + HRIG<br>VRVg-2 4 injections: 2 at Day 0, 1 at Day 7, 1 at Day 21 + HRIG at D0 | Biological: Purified vero rabies vaccine - serum free<br>* Pharmaceutical form:freeze-dried - Route of administration: intramuscular<br>* Other names: VRVg-2;Biological: Human rabies immunoglobulins<br>* Pharmaceutical form:liquid/solution in 2 mL vials - Route of administration: intramuscular<br>* Other names: HRIG;|
| Active Comparator: Group 2: Verorab + HRIG<br>Verorab 4 injections: 2 at Day 0, 1 at Day 7, 1 at Day 21 + HRIG at D0 | Biological: Purified inactivated rabies vaccine<br>* Pharmaceutical form:freeze-dried - Route of administration: intramuscular<br>* Other names: Verorab;Biological: Human rabies immunoglobulins<br>* Pharmaceutical form:liquid/solution in 2 mL vials - Route of administration: intramuscular<br>* Other names: HRIG;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of participants achieving rabies virus neutralizing antibody (RVNA) titer greater than or equal to (≥) 0.5 IU/mL | RVNA titers will be measured by rapid fluorescent focus inhibition test (RFFIT) | Day 14 (post-vaccination) | 
| Percentage of participants achieving RVNA titer greater than or equal to (≥) 0.5 IU/mL | RVNA titers will be measured by RFFIT | Day 35 (post-vaccination) | 
| Number of Participants achieving RVNA titer greater than or equal to (≥) lower limit of quantification | RVNA titers will be measured by RFFIT - Lower limit of quantification for RFFIT assay is 0.2 IU/mL | Day 14 (post-vaccination) | 
| Number of Participants achieving RVNA titer greater than or equal to (≥) lower limit of quantification | RVNA titers will be measured by RFFIT - Lower limit of quantification for RFFIT assay is 0.2 IU/mL | Day 35 (post-vaccination) | 
| Geometric Mean Titer Ratio (GMTR) of individual RVNA titer: (post-/pre-vaccination) | RVNA titers against rabies virus will be measured by RFFIT at Day 0 and Day 14 - RVNA ratios Day14/Day0 will be calculated | Day 14 (post-vaccination | 
| Geometric Mean Titer Ratio (GMTR) of individual RVNA titer: (post-/pre-vaccination) | RVNA titers against rabies virus will be measured by RFFIT at Day 0 and Day 35 - RVNA ratios Day35/Day0 will be calculated | Day 35 (post-vaccination) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of participants reporting immediate adverse events (AEs) | Unsolicited (spontaneously reported) systematic AEs | Within 30 minutes post-vaccination | 
| Percentage of participants reporting solicited injection site and systemic reactions | Solicited injection site reactions: - pain, erythema, and swelling in adults (aged ≥ 18 years) Solicited systemic reactions: - fever, headache, malaise and myalgia in adults (aged ≥ 18 years) | Within 7 days post-vaccination | 
| Number of participants reporting unsolicited injection site AEs | Unsolicited injection site AEs | Within 28 days post-vaccination | 
| Number of participants reporting unsolicited systemic AEs | Unsolicited systemic AEs | Between each vaccination and up to 28 days after the last vaccination | 
| Number of participants reporting serious adverse events (SAEs) | SAEs, including adverse event of special interest (AESIs) | Up to 6 months after last vaccination | 
| Percentage of participants achieving rabies virus neutralizing antibody (RVNA) titer greater than or equal to (≥) 0.5 IU/mL | RVNA titers will be measured by RFFIT | Day 90 (post-vaccination) | 
| Number of Participants achieving RVNA titer greater than or equal to (≥) lower limit of quantification | RVNA titers will be measured by RFFIT - Lower limit of quantification for RFFIT assay is 0.2 IU/mL | Day 90 (post-vaccination) | 
| Geometric Mean Titer Ratio (GMTR) of individual RVNA titer: (post-/pre-vaccination) | RVNA titers against rabies virus will be measured by RFFIT at Day 0 and Day 90 - RVNA ratios Day90/Day0 will be calculated | Day 90 (post-vaccination) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Rabies