Received: 20 November 2020
Accepted: 4 May 2021
First Online: 11 October 2021
: Not applicable. Programmatic data (secondary data) used for this Analysis. Data used for this work was made available the immunization programme and the National Yellow fever surveillance at National and state levels.
: Our paper contained no personal individual information and so no consent was required for this publication.
: All the authors have reported no conflicting interest in the development of this paper.