A Study of SII Yellow Fever Vaccine to Compare Safety and Immunogenicity With STAMARIL® In Healthy Infants

Inclusion Criteria:

1. Healthy infants as established by medical history and clinical examination
2. Male or female infants aged 9 to < 12 months (from the day they reach 9 months-of-ageuntil the day before they reach 12-months/1-year-of-age)
3. Parental/ guardian ability and willingness to provide informed consent (as per localrequirements/procedures), and to adhere to the protocol requirements.
4. Intend to remain residing in the study area throughout study participation
5. Parents/guardians willing to avoid the use of traditional/herbal local medications andtreatments in infants for the duration of the study

Exclusion Criteria:

1. Fever (> 37.5°C) or any clinically significant acute infection at time of vaccination [Temporary exclusion criteria - participants may be rescreened at least 48 hours afterthe last recorded fever].
2. Previous history of laboratory confirmed infection with yellow fever, measles, mumps,rubella, Neisseria meningitidis serogroup A, and other flaviviruses e.g., denguefever, tick-borne-encephalitis (TBE), Japanese encephalitis (JE), West Nile virus (WNV), zika virus, etc.
3. Previous vaccination against yellow fever, measles, mumps, rubella, Neisseriameningitidis serogroup A, TBE, JE, or dengue fever.
4. Receipt of any vaccine within past 28 days or planned vaccination until completion ofday 28 study visit 7. A known hypersensitivity to any of the vaccine components (includinggelatin, eggs, egg products, or chicken protein) or history of a life threatening reactionto any past vaccine 8. Receipt of immunoglobulin therapy and/or blood products since birthor planned administration until completion of Day 28 visit 9. Current or plannedparticipation in another interventional study at any point throughout the entire studyperiod 10. Receipt of any other investigational product or unlicensed medication in thepreceding 28 days, or planned use until completion of Day 28 visit 7. Presence ofsignificant malnutrition (weight-for-height z-score < -3SD)