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Takeda's Dengue Tetravalent Vaccine

Phase 3

Dengue Fever | Monoclonal antibody | Infectious Disease |Takeda Pharmaceutical Company Limited|Last Updated: Jul 30, 2026

Target and mechanism

ModalityMonoclonal antibody

Also known as Takeda's Dengue Tetravalent Vaccine (Live, Attenuated) (TDV)

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment365

FDA Designations

No designations recorded

Clinical trial landscape

Takeda's Dengue Tetravalent Vaccine · 1 trial · 1 indication

Phase 3 1
NCT03999996Long-Term Safety and Antibody Persistence of TDV and the Impact of a Booster DoseDengue Fever
COMPLETED365 Analytics
PHASE3COMPLETED
Long-Term Safety and Antibody Persistence of TDV and the Impact of a Booster Dose
Dengue FeverUnlock trial analytics

Study Endpoints

Primary Endpoints

Geometric Mean Titers (GMTs) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes in the Period Prior to Booster at Visit 1 (Month 0 [Day 1])
Month 0 (Day 1)

GMTs of neutralizing antibodies were measured by microneutralization test 50% (MNT50) for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 1 at Month 0 for participants from both parent trials (DEN-304 and DEN-315).

Geometric Mean Titers (GMTs) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes in the Period Prior to Booster at Visit 2 (Month 12)
Month 12

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 2 at Month 12 for participants from both parent trials (DEN-304 and DEN-315).

Geometric Mean Titers (GMTs) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes in the Period Prior to Booster at Visit 3 (Month 15) (DEN-304)
Month 15 (DEN-304)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 3 at Month 15 for participants from parent trial DEN-304.

Geometric Mean Titers (GMTs) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes in the Period Prior to Booster at Visit 3 (Month 42) (DEN-315)
Month 42 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 3 at Month 42 for participants from parent trial DEN-315.

Geometric Mean Titers (GMTs) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 1 (Month 0 [Day 1])
Month 0 [Day 1)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 1 at Month 0 for participants from both parent trials (DEN-304 and DEN-315).

Geometric Mean Titers (GMTs) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 2 (Month 12)
Month 12

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 2 at Month 12 for participants from both parent trials (DEN-304 and DEN-315).

Geometric Mean Titers (GMTs) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 15) (DEN-304)
Month 15 (DEN-304)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 3 at Month 15 for participants from parent trial DEN-304.

Geometric Mean Titers (GMTs) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 42) (DEN-315)
Month 42 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 3 at Month 42 for participants from parent trial DEN-315.

Seropositivity Rate for Each of the 4 Dengue Serotypes in the Period Prior to Booster at Visit 1 (Month 0 [Day 1])
Month 0 (Day 1)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 1 at Month 0 for participants from both parent trials (DEN-304 and DEN-315).

Seropositivity Rate for Each of the 4 Dengue Serotypes in the Period Prior to Booster at Visit 2 (Month 12)
Month 12

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 2 at Month 12 for participants from both parent trials (DEN-304 and DEN-315).

Seropositivity Rate for Each of the 4 Dengue Serotypes in the Period Prior to Booster at Visit 3 (Month 15) (DEN-304)
Month 15 (DEN-304)

Seropositivity Rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3 at Month 15 for participants from parent trial DEN-304.

Seropositivity Rate for Each of the 4 Dengue Serotypes in the Period Prior to Booster at Visit 3 (Month 42) (DEN-315)
Month 42 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3 at Month 42 for parent trial DEN-315.

Seropositivity Rate for Each of the 4 Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 1 [Month 0 (Day 1])
Month 0 (Day 1)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 1 at Month 0 for participants from both parent trials (DEN-304 and DEN-315).

Seropositivity Rate for Each of the 4 Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 2 (Month 12)
Month 12

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 2 at Month 12 for participants from both parent trials (DEN-304 and DEN-315).

Seropositivity Rate for Each of the 4 Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 15) (DEN-304)
Month 15 (DEN-304)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3 at Month 15 for participants from parent trial DEN-304.

Seropositivity Rate for Each of the 4 Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 42) ((DEN-315)
Month 42 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3 at Month 42 for parent trial DEN-315.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes in the Period Prior to Booster at Visit 1 (Month 0 [Day 1])
Month 0 (Day 1)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 1 at Month 0 for both parent trials (DEN-304 and DEN-315).

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes in the Period Prior to Booster at Visit 2 (Month 12)
Month 12

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 2 at Month 12 for both parent trials (DEN-304 and DEN-315).

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes in the Period Prior to Booster at Visit 3 (Month 15) (DEN-304)
Month 15 (DEN-304)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3 at Month 15 for parent trial DEN-304.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes in the Period Prior to Booster at Visit 3 (Month 42) (DEN-315)
Month 42 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3 at Month 42 for parent trial DEN-315.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 1 (Month 0 [Day 1])
Month 0 (Day 1)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 1 at Month 0 for both parent trials (DEN-304 and DEN-315).

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 2 (Month 12)
Month 12

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 2 at Month 12 for both parent trials (DEN-304 and DEN-315).

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 15) (DEN-304)
Month 15 (DEN-304)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. (DEN-304). All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3 at Month 15 for parent trial DEN-304.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes in the Period Prior to Booster by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 42) (DEN-315)
Month 42 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3 at Month 42 for parent trial DEN-315.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at Pre-Booster Dose at Visit 3 for Both Parent Trials
Pre-booster dose at Month 15 (DEN-304) and Month 42 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 3, pre-booster dose for all participants (Month 15 for parent trial DEN-304 and Month 42 for parent trial DEN-315). Pre-booster dose is defined as the last non-missing value before booster administration.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose at Visit 4 for Both Parent Trials
1 month post-booster dose at Month 16 (DEN-304) and Month 43 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 4, 1 month post-booster dose for all participants (Month 16 for parent trial DEN-304 and Month 43 for parent trial DEN-315).

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose at Visit 5 for Both Parent Trials
6 months post-booster dose at Month 21 (DEN-304) and Month 48 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 5, 6 months post-booster dose for all participants (Month 21 for parent trial DEN-304 and Month 48 for parent trial DEN-315).

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at Pre-Booster Dose at Visit 3 (Month 15) (DEN-304)
Pre-booster dose at Month 15 (DEN-304)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the pre-booster data from Visit 3 at Month 15 for participants from parent trial DEN-304. Pre-booster dose is defined as the last non-missing value before booster administration.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose at Visit 4 (Month 16) (DEN-304)
1 month post-booster dose at Month 16 (DEN-304)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 4 at Month 16 for participants from parent trial DEN-304.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose at Visit 5 (Month 21) (DEN-304)
6 months post-booster dose at Month 21 (DEN-304)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 5 at Month 21 for participants from parent trial DEN-304.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at Pre-Booster Dose at Visit 3 (Month 42) (DEN-315)
Pre-booster dose at Month 42 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the pre-booster data from Visit 3 at Month 42 for participants from parent trial DEN-315. Pre-booster dose is defined as the last non-missing value before booster administration.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose at Visit 4 (Month 43) (DEN-315)
1 month post-booster dose at Month 43 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 4 at Month 43 for participants from parent trial DEN-315.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose at Visit 5 (Month 48) (DEN-315)
6 months post-booster dose at Month 48 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Reported here is the data from Visit 5 at Month 48 for participants from parent trial DEN-315.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at Pre-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 3 for Both Parent Trials
Pre-booster dose at Month 15 (DEN-304) and Month 42 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 3, pre-booster dose for all participants (Month 15 for parent trial DEN-304 and Month 42 for parent trial DEN-315). Pre-booster dose is defined as the last non-missing value before booster administration.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 4 for Both Parent Trials
1 month post-booster dose at Month 16 (DEN-304) and Month 43 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 4, 1 month post-booster dose for all participants (Month 16 for parent trial DEN-304 and Month 43 for parent trial DEN-315).

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 5 for Both Parent Trials
6 months post-booster dose at Month 21 (DEN-304) and Month 48 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 5, 6 month post-booster dose for all participants (Month 21 for parent trial DEN-304 and Month 48 for parent trial DEN-315).

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at Pre-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 15) (DEN-304)
Pre-booster dose at Month 15 (DEN-304)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the pre-booster data from Visit 3 at Month 15 for participants from parent trial DEN-304. Pre-booster dose is defined as the last non-missing value before booster administration.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 4 (Month 16) (DEN-304)
1 month post-booster dose at Month 16 (DEN-304)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 4 at Month 16 for participants from parent trial DEN-304.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 5 (Month 21) (DEN-304)
6 months post-booster dose at Month 21 (DEN-304)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 5 at Month 21 for participants from parent trial DEN-304.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at Pre-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 42) (DEN-315)
Pre-booster dose at Month 42 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the pre-booster data from Visit 3 at Month 42 for participants from parent trial DEN-315. Pre-booster dose is defined as the last non-missing value before booster administration.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 4 (Month 43) (DEN-315)
1 month post-booster dose at Month 43 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 4 at Month 43 for participants from parent trial DEN-315.

GMTs of Neutralizing Antibodies for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 5 (Month 48) (DEN-315)
6 months post-booster dose at Month 48 (DEN-315)

GMTs of neutralizing antibodies were measured by MNT50 for each of the 4 Dengue Serotypes (DENV-1, DENV-2, DENV-3 and DENV-4). Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. Reported here is the data from Visit 5 at Month 48 for participants from parent trial DEN-315.

Seropositivity Rate for Each of the 4 Dengue Serotypes at Pre-Booster Dose at Visit 3 for Both Parent Trials
Pre-booster dose at Month 15 (DEN-304) and Month 42 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3, pre-booster dose for all participants (Month 15 for parent trial DEN-304 and Month 42 for parent trial DEN-315). Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose at Visit 4 for Both Parent Trials
1 month post-booster dose at Month 16 (DEN-304) and Month 43 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4, 1 month post-booster dose for all participants (Month 16 for parent trial DEN-304 and Month 43 for parent trial DEN-315).

Seropositivity Rate for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose at Visit 5 for Both Parent Trials
6 months post-booster dose at Month 21 (DEN-304) and Month 48 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5, 6 month post-booster dose for all participants (Month 21 for parent trial DEN-304 and Month 48 for parent trial DEN-315).

Seropositivity Rate for Each of the 4 Dengue Serotypes at Pre-Booster Dose at Visit 3 (Month 15) (DEN-304)
Pre-booster dose at Month 15 (DEN-304)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the pre-booster data from Visit 3 at Month 15 for participants from parent trial DEN-304. Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose at Visit 4 (Month 16) (DEN-304)
1 month post-booster dose at Month 16 (DEN-304)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4 at Month 16 for participants from parent trial DEN-304.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose at Visit 5 (Month 21) (DEN-304)
6 months post-booster dose at Month 21 (DEN-304)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5 at Month 21 for participants from parent trial DEN-304.

Seropositivity Rate for Each of the 4 Dengue Serotypes at Pre-Booster Dose at Visit 3 (Month 42) (DEN-315)
Pre-booster dose at Month 42 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the pre-booster data from Visit 3 at Month 42 for participants from parent trial DEN-315. Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose at Visit 4 (Month 43) (DEN-315)
1 month post-booster dose at Month 43 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4 at Month 43 for participants from parent trial DEN-315.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose at Visit 5 (Month 48) (DEN-315)
6 months post-booster dose at Month 48 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5 at Month 48 for participants from parent trial DEN-315.

Seropositivity Rate for Each of the 4 Dengue Serotypes at Pre-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 3 for Both Parent Trials
Pre-booster dose at Month 15 (DEN-304) and Month 42 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3, pre-booster dose for all participants (Month 15 for parent trial DEN-304 and Month 42 for parent trial DEN-315). Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 4 for Both Parent Trials
1 month post-booster dose at Month 16 (DEN-304) and Month 43 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4, 1 month post-booster dose for all participants (Month 16 for parent trial DEN-304 and Month 43 for parent trial DEN-315).

Seropositivity Rate for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 5 for Both Parent Trials
6 months post-booster dose at Month 21 (DEN-304) and Month 48 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5, 6 month post-booster dose for all participants (Month 21 for parent trial DEN-304 and Month 48 for parent trial DEN-315).

Seropositivity Rate for Each of the 4 Dengue Serotypes at Pre-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 15) (DEN-304)
Pre-booster dose at Month 15 (DEN-304)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the pre-booster data from Visit 3 at Month 15 for participants from parent trial DEN-304. Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 4 (Month 16) (DEN-304)
1 month post-booster dose at Month 16 (DEN-304)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4 at Month 16 for participants from parent trial DEN-304.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 5 (Month 21) (DEN-304)
6 months post-booster dose at Month 21 (DEN-304)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5 at Month 21 for participants from parent trial DEN-304.

Seropositivity Rate for Each of the 4 Dengue Serotypes at Pre-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 42) (DEN-315)
Pre-booster dose at Month 42 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the pre-booster data from Visit 3 at Month 42 for participants from parent trial DEN-315. Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 1 Month Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 4 (Month 43) (DEN-315)
1 month post-booster dose at Month 43 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4 at Month 43 for participants from parent trial DEN-315.

Seropositivity Rate for Each of the 4 Dengue Serotypes at 6 Months Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 5 (Month 48) (DEN-315)
6 months post-booster dose at Month 48 (DEN-315)

Seropositivity rate, defined as the percentage of participants seropositive, is derived from the titers of dengue-neutralizing antibodies. Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5 at Month 48 for participants from parent trial DEN-315.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at Pre-Booster Dose at Visit 3 for Both Parent Trials
Pre-booster dose at Month 15 (DEN-304) and Month 42 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3, pre-booster dose for all participants (Month 15 for parent trial DEN-304 and Month 42 for parent trial DEN-315). Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at 1 Month Post-Booster Dose at Visit 4 for Both Parent Trials
1 month post-booster dose at Month 16 (DEN-304) and Month 43 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4, 1 month post-booster dose for all participants (Month 16 for parent trial DEN-304 and Month 43 for parent trial DEN-315).

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes Post-Booster Dose at 6 Months Post-Booster Dose at Visit 5 for Both Parent Trials
6 months post-booster dose at Month 21 (DEN-304) and Month 48 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5, 6 month post-booster dose for all participants (Month 21 for parent trial DEN-304 and Month 48 for parent trial DEN-315).

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at Pre-Booster Dose at Visit 3 (Month 15) (DEN-304)
Pre-booster dose at Month 15 (DEN-304)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the pre-booster data from Visit 3 at Month 15 for participants from parent trial DEN-304. Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at 1 Month Post-Booster Dose at Visit 4 (Month 16) (DEN-304)
1 month post-booster dose at Month 16 (DEN-304.)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4 at Month 16 for participants from parent trial DEN-304.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes Post-Booster Dose at 6 Months Post-Booster Dose at Visit 5 (Month 21) (DEN-304)
6 months post-booster dose at Month 21 (DEN-304)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5 at Month 21 for participants from parent trial DEN-304.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at Pre-Booster Dose at Visit 3 (Month 42) (DEN-315)
Pre-booster dose at Month 42 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the pre-booster data from Visit 3 at Month 42 for participants from parent trial DEN-315. Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes Post-Booster Dose at 1 Month Post-Booster Dose at Visit 4 (Month 43) (DEN-315)
1 month post-booster dose at Month 43 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4 at Month 43 for participants from parent trial DEN-315.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes Post-booster Dose at 6 Months Post-Booster Dose at Visit 5 (Month 48) (DEN-315)
6 months post-Booster dose at Month 48 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5 at Month 48 for participants from parent trial DEN-315.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at Pre-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 3 for Both Parent Trials
Pre-booster dose at Month 15 (DEN-304) and Month 42 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), \\ any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 3, pre-booster dose for all participants (Month 15 for parent trial DEN-304 and Month 42 for parent trial DEN-315). Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at 1 Month Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 4 for Both Parent Trials
1 month post-booster dose at Month 16 (DEN-304) and Month 43 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), \\ any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4, 1 month post-booster dose for all participants (Month 16 for parent trial DEN-304 and Month 43 for parent trial DEN-315).

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes Post-Booster Dose at 6 Months Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 5 for Both Parent Trials
6 months post-booster dose at Month 21 (DEN-304) and Month 48 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5, 6 month post-booster dose for all participants (Month 21 for parent trial DEN-304 and Month 48 for parent trial DEN-315).

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at Pre-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 15) (DEN-304)
Pre-booster dose at Month 15 (DEN-304)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), \\ any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the pre-booster data from Visit 3 at Month 15 for participants from parent trial DEN-304. Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at 1 Month Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 4 (Month 16) (DEN-304)
1 month post-booster dose at Month 16 (DEN-304)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), \\any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4 at Month 16 for participants from parent trial DEN-304.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes Post-Booster Dose at 6 Months Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 5 (Month 21) (DEN-304)
6 months post-booster dose at Month 21 (DEN-304)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5 at Month 21 for participants from parent trial DEN-304.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at Pre-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 3 (Month 42) (DEN-315)
Pre-booster dose at Month 42 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the pre-booster data from Visit 3 at Month 42 for participants from parent trial DEN-315. Pre-booster dose is defined as the last non-missing value before booster administration.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes at 1 Month Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 4 (Month 43) (DEN-315)
1 month post-booster dose at Month 43 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 4 at Month 43 for participants from parent trial DEN-315.

Seropositivity Rate for Multiple (2, 3 or 4) Dengue Serotypes Post-booster Dose at 6 Months Post-Booster Dose by Serostatus at Baseline in the Parent Trials at Visit 5 (Month 48) (DEN-315)
6 months post-Booster dose at Month 48 (DEN-315)

Seropositivity rate for multiple Dengue serotypes, defined as the percentage of participants seropositive for more than one Dengue serotype, is derived from the titers of dengue-neutralizing antibodies. All 4 dengue serotypes (tetravalent), any 2 of the 4 dengue serotypes (bivalent), any 3 of the 4 dengue serotypes (trivalent). Seropositivity is defined as a reciprocal neutralizing titer ≥10. Baseline seropositivity is defined as reciprocal neutralizing titer ≥10 for one or more dengue serotypes at baseline in the parent trial. The 4 dengue virus serotypes are DENV-1, DENV-2, DENV-3 and DENV-4. Reported here is the data from Visit 5 at Month 48 for participants from parent trial DEN-315.

Secondary Endpoints

Geometric Mean Ratio (GMR) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes for All Participants Prior to the Booster Dose
Month 12 vs Month 0, Month 15 (DEN-304) vs parent trial Month 4, Mont 42 (DEN315) vs parent trial Month 4, Month 0 vs parent trial Month 9, Month 12 vs parent trial Month 9
Geometric Mean Ratio (GMR) of Neutralizing Antibodies for Each of the 4 Dengue Serotypes by Serostatus at Baseline in the Parent Trials Prior to the Booster Dose
Month 12 vs Month 0, Month 15 (DEN-304) vs parent trial Month 4, Month 42 (DEN315) vs parent trial Month 4, Month 0 vs parent trial Month 9, Month 12 vs parent trial Month 9
GMR of Neutralizing Antibodies for Each of the 4 Dengue Serotypes in the Booster Phase
Months (M) 1&6 post-booster dose in current trial vs M 4 in parent trials; post-booster M 6 vs post-booster M 1; post-booster M 1 vs pre-booster (M 15 for DEN-304/M 42 for DEN-315); post-booster M 6 vs pre-booster (M 15 for DEN-304/M 42 for DEN-315)
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Prior to Booster: DEN-304EXPERIMENTALParticipants who received TDV in parent trial DEN-304 (US) were assessed before they received booster dose (Placebo/TDV) at Month 15.
Prior to Booster: DEN-315EXPERIMENTALParticipants who received TDV in parent trial DEN-315 (Mexico) were assessed before they received booster dose (Placebo/TDV) at Month 42.
Booster Phase: PlaceboPLACEBO_COMPARATORParticipants received TDV placebo-matching 0.5 milliliters (ml) injection, subcutaneous (SC), once at Month 15 for participants from parent trial DEN-304 (US) or once at Month 42 for participants from parent trial DEN-315 (Mexico).
Booster Phase: TDVEXPERIMENTALParticipants received TDV 0.5 ml, injection, SC, once at Month 15 for participants from parent trial DEN-304 (US) or once at Month 42 for participants from parent trial DEN-315 (Mexico).

Interventions

NameTypeDescription
Takeda's Dengue Tetravalent Vaccine (Live, Attenuated) (TDV)BIOLOGICALTDV subcutaneous injection
PlaceboBIOLOGICALNormal Saline (0.9% NaCl) subcutaneous injection
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Eligibility Criteria

Age Range13 Years to 63 Years
SexALL
Healthy VolunteersYes
Study Sites10

Inclusion Criteria: 1\. Male or female participants (irrespective of serostatus at baseline in the parent trials (DEN-304 \[(NCT03423173)\] and DEN-315 \[NCT03341637\]) who received at least one dose of Takeda's tetravalent dengue vaccine candidate (TDV) in the parent trials and have data from at l...

Countries:United StatesMexico
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Recent Changes (Last 90 Days)

MEDIUMAug 30, 2026NCT03999996TRIAL_REMOVED: changed
MEDIUMAug 30, 2026NCT03999996TRIAL_REMOVED: changed
MEDIUMAug 30, 2026NCT03999996TRIAL_REMOVED: changed