Study of CYD Dengue Vaccine in Healthy Children and Adolescents in South America

Sanofi Pasteur, a Sanofi Company150 enrolled

Overview

The purpose of this study is to generate immunogenicity and safety data in preparation for efficacy studies in Latin America. Primary Objectives: * To describe the immune response to dengue viruses before and after each vaccination with CYD dengue vaccine. * To evaluate the safety of each vaccination with CYD dengue vaccine.

Participants in the Dengue Vaccine Group will receive 3 vaccinations with CYD Dengue vaccine. Participants in the Control Group will receive placebo vaccinations for the first 2 vaccinations, followed by tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis vaccine adsorbed (ADACEL®) (in Venezuela) or Meningococcal A+C vaccine (in Brazil) as a way of providing therapeutic benefit to the participants in the control group.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

QUADRUPLE

Enrollment

150

Conditions

Dengue Dengue Hemorrhagic Fever

Interventions

Live, attenuated, recombinant dengue serotype 1 , 2, 3 , and 4 virusBIOLOGICAL

0.5 mL, Subcutaneous (SC)

NaCl 0.9%BIOLOGICAL

0.5 mL, Subcutaneous

Tetanus toxoid, reduced diphtheria toxoid, acellular pertussis vaccine adsorbedBIOLOGICAL

0.5 mL, Intramuscular

Eligibility

Sex: ALLMin age: 9 YearsMax age: 16 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria : * Aged 9 to 16 years on the day of inclusion * Participant in good health, based on medical history and physical examination * Provision of assent form/informed consent form signed by the participant and by the parent(s) or another legally acceptable representative * Participant and parent(s)/legally acceptable representative(s) able to attend all scheduled visits and to comply with all trial procedures * For a female participant of child-bearing potential, avoid becoming pregnant (use of an effective method of contraception or abstinence) for at least 4 weeks prior to first vaccination until at least 4 weeks after the last vaccination Exclusion Criteria : * Personal or family history of thymic pathology (thymoma), thymectomy, or myasthenia * For a female participant of child-bearing potential, known pregnancy or positive urine pregnancy test at Visit 1 * Participation in another clinical trial investigating a vaccine, drug, medical device, or a medical procedure in the 4 weeks preceding the first trial vaccination * Breast-feeding woman * Planned participation in another clinical trial during the present trial period * Known or suspected congenital or acquired immunodeficiency, immunosuppressive therapy such as anti-cancer chemotherapy or radiation therapy within the preceding 6 months, or long-term systemic corticosteroids therapy * Known systemic hypersensitivity to any of the components of any of the trial vaccines or history of a life-threatening reaction to any of the trial vaccines or to a vaccine containing any of the same substances * Chronic illness at a stage that could interfere with trial conduct or completion, in the opinion of the Investigator * Current alcohol abuse or drug addiction that may interfere with the participant's ability to comply with trial procedures * Receipt of blood or blood-derived products in the preceding 3 months that might interfere with the assessment of immune response * Receipt of any vaccine in the 4 weeks preceding the first trial vaccination * Planned receipt of any vaccine in the 4 weeks following the first trial vaccination * Participant deprived of freedom by administrative or court order, or in an emergency setting, or hospitalized without his/her consent * Febrile illness (temperature ≥ 38.0 ºC) or moderate or severe acute illness/infection on the day of vaccination, according to Investigator judgment * Thrombocytopenia, bleeding disorder or anticoagulants in the 3 weeks preceding inclusion contraindicating intramuscular vaccination * Severe diseases with or without fever, convulsions or neurological abnormalities without treatment or in progression.

Locations (1)

Unnamed facility

Vitória, Brazil

Outcomes

Primary Outcomes

Percentage of Participants With Seropositivity Against Each Serotype With the Parental Dengue Virus Strains Before and After Vaccinations With Either CYD Dengue Vaccine or a Placebo

Seropositivity was defined as participants achieving neutralizing antibody titers ≥10 (1/dil) against each serotype and was assessed using the Dengue Plaque Reduction Neutralization Test (PRNT).

Time frame: Before and 28 days after each injection

Percentage of Flavivirus Immune Participants With Seropositivity Against Each Serotype With the Parental Dengue Virus Strains Before and After Vaccinations With Either CYD Dengue Vaccine or a Placebo

Seropositivity was defined as participants achieving neutralizing antibody titers ≥10 (1/dil) against each serotype and was assessed using the Dengue Plaque Reduction Neutralization Test (PRNT). Flavivirus immune subjects at baseline are defined as those subjects with ≥10 (1/dil) for at least 1 serotype with the parental dengue virus strain or for the yellow fever titer.

Time frame: Before and 28 days after each injection

Percentage of Flavivirus Naïve Subjects With Seropositivity Against Each Serotype With the Parental Dengue Virus Strains Before and After Vaccinations With Either CYD Dengue Vaccine or a Placebo

Seropositivity was defined as participants achieving neutralizing antibody titers ≥10 (1/dil) against each serotype and was assessed using the Dengue Plaque Reduction Neutralization Test (PRNT). Flavivirus naïve subjects at baseline are defined as those subjects with \<10 (1/dil) for all serotypes with parental dengue virus strains and for yellow fever titer.

Time frame: Before and 28 Days after each injection

Percentage of Subjects With Seropositivity Against At Least 1, 2, 3, or 4 Parental Dengue Virus Serotypes Before and After Vaccinations With Either CYD Dengue Vaccine or a Placebo

Seropositivity was defined as participants achieving neutralizing antibody titers ≥10 (1/dil) against each serotype and was assessed using the Dengue Plaque Reduction Neutralization Test (PRNT).

Time frame: Before and 28 days after each injection

Data from ClinicalTrials.gov

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