Immunogenicity and Safety of Different Vaccination Schedules of Tetravalent Dengue Vaccine in Healthy Subjects 9 to 50 Years of Age

Dengue Fever Clinical Trial

Official title: Immunogenicity and Safety of Tetravalent Dengue Vaccine Given in 1-, 2-, or 3- Dose Schedules (STAGE I) Followed by a Single Booster Injection of the Same Vaccine (STAGE II) 1 or 2 Years After the Last Primary Dose in Healthy Subjects 9 to 50 Years of Age in Colombia and the Philippines

Status Completed

Clinical Trial Summary

The aim of the study was to assess the immune response and the safety of different vaccination schedules of CYD dengue vaccine.

The primary objectives of the study were:

• To demonstrate the non-inferiority of the immune response elicited against each dengue serotype by CYD dengue vaccine given as a 2-dose schedule (Group 2) compared to the immune response elicited by CYD dengue vaccine given as a 3-dose schedule (Group 1), in previously dengue exposed participants 28 days after the last injection.

• To demonstrate the non-inferiority of the immune response elicited against each dengue serotype by CYD dengue vaccine given as a 2-dose schedule (Group 2) compared to the immune response elicited by CYD vaccine given as a 3-dose schedule (Group 1) in previously dengue exposed participants, 1 year after the last injection.

• To demonstrate the non-inferiority of the immune response elicited against each dengue serotype elicited by a booster dose of CYD dengue vaccine one year or two years after the last injection in the primary series in previously dengue exposed participants, compared to the immune response post dose 3 in Group 1.

The secondary objectives of the study were:

• To demonstrate the superiority of the immune response elicited by CYD dengue vaccine given as a 2-dose schedule (Group 2) compared to the immune response elicited by CYD dengue vaccine given as a 3-dose schedule (Group 1), in previously dengue exposed participants, 28 days after the last injection.

• To demonstrate the superiority of the immune response elicited by CYD dengue vaccine given as a 2-dose schedule (Group 2) compared to the immune response elicited by CYD dengue vaccine given as a 3-dose schedule (Group 1), in previously dengue exposed participants, one year after the last injection.

• To describe the neutralizing antibody levels of each dengue serotype at 28 days post-injection 3 to the antibody levels immediately before receiving a booster dose, by baseline dengue serostatus.

• To describe the neutralizing antibody levels of each dengue serotype at 28 days post-injection 2 and 28 days post-injection 3 from Group 1 in a primary series schedule by baseline dengue serostatus.

• To demonstrate the superiority of the immune response elicited against each dengue serotype 28 days after administration of a booster dose of CYD dengue vaccine, in previously dengue exposed participants, at one year or two years after last injection in the primary series.

• To describe the seroconversion rate 28 days post-booster injection in all 3 groups.

• To describe all hospitalized virologically confirmed dengue (VCD) cases during the study.

• To evaluate the safety profile of CYD after each and any injection during the trial. Safety assessments include solicited reactions within 7 or 14 days after each injection, unsolicited adverse events within 28 days after each injection, and serious adverse events during the study period.

Clinical Trial Description

Healthy participants aged between 9 and 50 year received CYD dengue vaccine in various schedules, in two sequential stages. In the first stage, participants received 1, 2 or 3 injections of CYD dengue vaccine over a 12-month period. In the second stage, participants were randomized to receive a booster dose of CYD dengue vaccine at either 12 months (Subgroup a) or 24 months (Subgroup b) after the third injection of study vaccine. During the conduction of this trial, the World Health Organization (WHO) indication about vaccinating only baseline seropositive participants was arisen; at this moment, STAGE I of the trial was completed. For STAGE II, only participants who were previously dengue exposed at baseline (dengue seropositive) were eligible to receive the booster dose. ;

Related Conditions & MeSH terms

• Dengue
• Dengue Fever
• Dengue Hemorrhagic Fever
• Fever
• Hyperthermia
• Severe Dengue

• NCT number: NCT02628444
• Study type: Interventional
• Source: Sanofi
• Status: Completed
• Phase: Phase 2
• Start date: May 2, 2016
• Completion date: April 29, 2020