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Approval for the study was sought by first submitting our study proposal to the Research Governance Unit of the Nigeria Centre for Disease Control and Prevention (approval number: NCDC\/HQ\/GCOR\/V.III\/35; date of approval: April 12, 2021). We sought additional ethical approval from the National Health Research Ethics Committee (approval number: NHREC\/01\/01\/2007-04\/10\/2023; date of approval: October 4, 2023.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical Approval"}},{"value":"Patient consent was waived as this study utilized secondary data which has been previously collected, stored, and analyzed as part of outbreak response activity by the NCDC, during which a case investigation form was administered by clinical staff to obtain relevant information from suspected cases of YF to which they consented in writing or orally. In the case of minors, informed consent was given by either a parent or guardian, either in writing or verbal form, depending on their literacy status. The data was confidentially stored in passworded computer systems by the NCDC data management team and was shared in de-identified and anonymized Microsoft Excel format for this study.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to Participate"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing Interests"}}],"article-number":"2"}}