Duration of Immunity 10 Years After a Dose-response Study With Yellow Fever Vaccine - Complementary Study

Inclusion Criteria

• •Have participated as a volunteer of the study carried out in 2009.
• •Seronegative volunteers before vaccination in the study "Dose-response study of yellow fever vaccine 17DD produced by Bio-Manguinhos / Fiocruz" carried out in 2009. Non-revaccinated volunteers, seropositive in the study "Duration of immunity to yellow fever in volunteers eight years after a dose-response study", conducted in 2017.
• •Not having received another yellow fever vaccine after participating in the study "Dose-response study of the yellow fever vaccine produced by Bio-Manguinhos / Fiocruz" carried out in 2009 and the study "Duration of immunity to yellow fever in volunteers eight years after a dose-response study", conducted in 2017.
• •Available to follow up during the field study period.
• •Agree to give name, address, phone, and other contact information, if necessary.
• •Agree to strictly follow the study protocol.
• •Able to understand and sign the Informed Consent Form (ICF).
• •Understand the impossibility of participating in another clinical trial during the time of participation in this study.
• •Note: Individuals with a history of travel to areas endemic for yellow fever may be included but will be analyzed separately.