Phase 3 Single Arm, Open Study on vYF in Adults

Inclusion Criteria: * Aged from 18 years on the day of inclusion\* \* "From 18 years" means from the day of the 18th birthday * Participants who are healthy as determined by medical evaluation including medical history and physical examination. * Able to attend all scheduled visits and to comply with all study procedures * A female participant is eligible to participate if she is not pregnant or breastfeeding and one of the following conditions applies: * Is of non-childbearing potential. To be considered of non-childbearing potential, a female must be postmenopausal for at least 1 year, or surgically sterile. OR . Is of childbearing potential and agrees to use an effective contraceptive method or abstinence from at least 4 weeks prior to study intervention administration until at least 4 weeks after study intervention administration. A female participant of childbearing potential must have a negative highly sensitive pregnancy test (urine or serum as required by local regulation) before any dose of study intervention on Day 01 and will be repeated on Day 29 to confirm the participant is still not pregnant within the 28 days of vaccine administration. \- Informed consent form (ICF) has been signed and dated Exclusion Criteria: Participants are excluded from the study if any of the following criteria apply: * Known or suspected congenital or acquired immunodeficiency; or receipt of immunosuppressive therapy, such as anti-cancer chemotherapy, or radiation therapy, …