The vaccine tested in this study is TDV also known as TAK-003 (DENVax). TDV with concomitant and sequential administration of yellow fever (YF-17D) vaccine will be tested to assess immunogenicity and safety in healthy adult participants in non-endemic area(s) for both dengue and YF.~The study will enroll 900 healthy participants. Participants will be randomized to 3 groups in 1:1:1 ratio and will be administered concomitantly and sequentially. The 3 groups are:~Group 1: YF-17D vaccine + placebo concomitantly administered on Day 1, first dose of TDV administered on Day 90 and second dose of TDV administered on Day 180.~Group 2: first dose of TDV + placebo concomitantly administered on Day 1, second dose of TDV administered on Day 90 and YF-17D vaccine administered on Day 180.~Group 3: first dose of TDV + YF-17D vaccine concomitantly administered on Day 1, second dose of TDV administered on Day 90 and placebo administered on Day 180.~This multi-center trial will be conducted in the United States. The overall time to participate in this study is 360 days. Participants will make multiple visits to the clinic with a 6-month follow up including a final visit at Day 360 for a follow-up assessment.
The main purpose of this study is to assess the immunogenicity and safety of the concomitant and sequential administration of yellow fever (YF) vaccine and tetravalent dengue vaccine (TDV) in healthy participants aged 18 to 60 years living in country non-endemic for both dengue and YF.