Immunogenicity and Safety of Tetravalent Dengue Vaccine (TDV) at the End of Shelf Life in Healthy Adults

Study Overview
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Brief Summary
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The purpose of this study is to evaluate the safety and immune response of a naturally aged lot of tetravalent dengue vaccine (TDV) in healthy participants, aged 18 to 60 years, in non-endemic country(ies) for dengue.

Detailed Description
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The vaccine being tested in this study is tetravalent dengue vaccine (TDV). The primary objective of this study is to evaluate the immune response and safety of a naturally aged (>12 months stored at 2°C to 8°C) lot of TDV in a healthy adult population in country(ies) non-endemic for dengue. The assessment of a naturally aged lot of TDV in this clinical trial will provide an important contribution to data on TDV stability throughout the shelf life of the product. The study will enroll approximately 200 participants. Participants will be enrolled to the one treatment group: Tetravalent Dengue Vaccine (TDV) All participants will receive subcutaneous (SC) injection on Day 1 (Month 0) and Day 90 (Month 3). This multi-center trial will be conducted in the United States. The overall time to participate in this study is 9 months. Participants will make multiple visits to the clinic including a final visit at Day 270 (Month 9).

Official Title
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An Open-Label, Phase 3 Trial to Investigate the Immunogenicity and Safety of Tetravalent Dengue Vaccine Candidate (TDV) at the End of Shelf Life in Healthy Adults in Non-Endemic Country(Ies) for Dengue

Conditions
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Dengue Fever

Intervention / Treatment
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* Biological: Tetravalent Dengue Vaccine (TDV)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Participants who are in good health at the time of entry into the trial as determined by medical history, physical examination (including vital signs), and the clinical judgment of the investigator. Participants who sign and date a written informed consent form and any required privacy authorization prior to the initiation of any trial procedures, after the nature of the trial has been explained according to local regulatory requirements. Exclusion Criteria: Participants with a clinically significant active infection (as assessed by the investigator) or body temperature ≥38°C (≥100.4°F) within 3 days of the intended date of vaccine administration Known or suspected impairment/alteration of immune function, including: Chronic use of oral steroids (equivalent to 20 mg/day prednisone ≥12 weeks and/or ≥2 mg/kg body weight/day prednisone ≥2 weeks) within 60 days prior to Day 1 (Month 0) (use of inhaled, intranasal, or topical corticosteroids is allowed). Receipt of parenteral steroids (equivalent to 20 mg/day prednisone ≥12 weeks and/or ≥2 mg/kg body weight/day prednisone ≥2 weeks) within 60 days prior to Day 1 (Month 0). Administration of immunoglobulins and/or any blood products within the 3 months prior to Day 1 (Month 0) or planned administration during the trial. Receipt of immunostimulants within 60 days prior to Day 1 (Month 0). Immunosuppressive therapy such as anti-cancer chemotherapy or radiation therapy within 6 months prior to Day 1 (Month 0). Known Human Immunodeficiency Virus (HIV) infection or HIV-related disease. Hepatitis C virus infection. Genetic immunodeficiency. With Body Mass Index (BMI) greater than or equal to 35 kg/m^2(=weight in kg/height in meters^2). Participants who have known hypersensitivity or allergy to any of the vaccine components. Previous and planned vaccination (during the trial conduct), against any flavivirus including dengue, Yellow Fever (YF), Japanese Encephalitis (JE) viruses or tick-borne encephalitis. Previous participation in any clinical trial of a dengue or other flavivirus (e.g., West Nile [WN] virus) candidate vaccine, except for participants who received placebo in those trials. With a current or previous infection with a flavivirus such as dengue, Zika, YF, JE, WN fever, tick-borne encephalitis or Murray Valley encephalitis and participants with a history of prolonged (≥1 year) habitation in a dengue endemic area. Participants with any history of progressive or severe neurologic disorder, seizure disorder or neuro-inflammatory disease (e.g., Guillain-Barré syndrome). Participants with history of substance or alcohol abuse within the past 2 years. Participants who have any serious chronic or progressive disease according to judgment of the Investigator (e.g., neoplasm, insulin dependent diabetes, cardiac, renal or hepatic disease).

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 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
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Tetravalent Dengue Vaccine (TDV)<br>TDV 0.5 mL, injection, subcutaneously (SC), once on Day 1 (first dose) and Day 90 (second dose). | Biological: Tetravalent Dengue Vaccine (TDV)<br>* TDV SC injection.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Geometric Mean Titers (GMT) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at Day 120 | GMTs of neutralizing antibodies for each of the 4 dengue serotypes were measured by microneutralization test 50% [MNT50]. The 4 dengue virus serotypes were DENV-1, DENV-2, DENV-3, and DENV-4. | One month post second dose (Day 120) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Seropositivity Rates for Each of the 4 Dengue Serotypes at Days 120 and 270 | Seropositivity rate was defined as the percentage of participants being seropositive, derived from titers of dengue-neutralizing antibodies. Seropositivity was defined as a reciprocal neutralizing titer ≥10 (for each serotype). Seropositivity rates were assessed for the four dengue serotypes: DENV-1, DENV-2, DENV-3, and DENV-4. | One month and six months post second dose (Days 120 and 270) | 
| Seropositivity Rates for Multiple (2, 3, or 4) Dengue Serotypes at Days 120 and 270 | Seropositivity rate was defined as the percentage of participants being seropositive, derived from titers of dengue-neutralizing antibodies. Seropositivity was defined as a reciprocal neutralizing titer ≥10. The dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Seropositivity for multiple dengue serotypes was summarized in the following categories: tetravalent and at least trivalent. | One month and six months post second dose (Days 120 and 270) | 
| Geometric Mean Titers (GMTs) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at Day 270 | GMTs of neutralizing antibodies were assessed for the four dengue serotypes: DENV-1, DENV-2, DENV-3, and DENV-4, by MNT50. | Six months post second dose (Day 270) | 
| Percentage of Participants With Solicited Local (Injection Site) Reactions Following Each Vaccination by Severity | Solicited local adverse events (AEs) [at injection site] were collected by participants using diary cards within 7 days after each vaccination and included injection site pain [Grade 0 (no pain), 1 (mild: no interference with daily activity), 2 (moderate: interference with daily activity with or without treatment) and 3 (severe: prevents daily activity with or without treatment)], injection site erythema [Grade 0 (<25 mm), 1 (25 - ≤ 50 mm), 2 (>50 - ≤ 100 mm), 3 (> 100 mm)] and injection site swelling [Grade 0 (<25 mm), 1 (25 - ≤ 50 mm), 2 (>50 - ≤ 100 mm), 3 (> 100 mm)]. The percentages were rounded off to the first decimal place. Only categories with at least 1 participant are reported. | Up to 7 days (Day of vaccination + 6 subsequent days) after each of the vaccination | 
| Percentage of Participants With Solicited Systemic Adverse Events Following Each Vaccination by Severity | Solicited systemic AEs were collected by participants using diary cards within 14 days after each vaccination and included fever, headache, asthenia, malaise and myalgia. Severity grades were: Grade 0: none, Grade 1: mild (no interference with daily activity), Grade 2: moderate (interference with daily activity with or without treatment), Grade 3: severe (prevents normal daily activity with or without treatment). Fever is defined as body temperature greater than or equal to 38°C (100.4°F). Fever was excluded from the overall count as no severity grading was applied for it. The percentages were rounded off to the first decimal place. Only categories with at least 1 participant are reported. | Up to 14 days (Day of vaccination + 13 subsequent days) after each vaccination | 
| Percentage of Participants With Any Unsolicited Adverse Events Following Each Vaccination | An AE is defined as any untoward medical occurrence in a clinical investigation participant administered a study vaccine; it does not necessarily have to have a causal relationship with study vaccine administration. | Up to 28 days after each vaccination (Day of vaccination + 27 subsequent days) | 
| Percentage of Participants With Serious Adverse Events (SAEs) | An SAE is defined as any untoward medical occurrence that results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability / incapacity, leads to a congenital anomaly / birth defect in the offspring of a participant, or is an important medical event which may require intervention to prevent the items listed above or may expose the participant to danger, even though the event is not immediately life threatening or fatal or does not result in hospitalization. | From first vaccination (Day 1) through end of study (Day 270) | 
| Percentage of Participants With Medically Attended Adverse Events (MAAEs) | MAAEs are defined as AEs leading to an unscheduled visit to or by a healthcare professional, including visits to an emergency department, but not fulfilling seriousness criteria. | From first vaccination (Day 1) through end of study (Day 270) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Live Attenuated Tetravalent Dengue Vaccine