This study aims to evaluate how long immunity lasts after the yellow fever vaccine in different age groups.
Cohort study design involving both children and adults
Assessment of immunity duration four years post-primary vaccination
Analysis of immune response to determine need for revaccination
Evidence indicates waning immunity after one dose of yellow fever vaccine
Findings support the need for revaccination, particularly in infants and toddlers
Implications highlighted for vaccination policies in endemic regions
Abstract
The evidence of waning immunity after a single dose of YF vaccine appears to support revaccination if primary vaccination targets infants and toddlers in endemic countries.