________________________________________ *Corresponding author: Email: dalatup@gmail.com; Asian J. Prob. Stat., vol. 23, no. 3, pp. 1-7, 2023 Asian Journal of Probability and Statistics Volume 23, Issue 3, Page 1-7, 2023; Article no.AJPAS.102389 ISSN: 2582-0230 _______________________________________________________________________________________________________________________________________ An Epidemiological Analysis of Lassa Fever Outbreak in Nigeria from January 2019 to June 2023 Paul I. Dalatu a* and Asabe Ibrahim a a Department of Mathematics, Faculty of Science, Adamawa State University, Mubi, Nigeria. Authors’ contributions This work was carried out in collaboration between both authors. Both authors read and approved the final manuscript. Article Information DOI: 10.9734/AJPAS/2023/v23i3503 Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/102389 Received: 21/06/2023 Accepted: 01/07/2023 Published: 19/07/2023 __________________________________________________________________________________ Abstract Lassa Fever (LF) is an acute viral haemorrhagic zoonotic disease, is endemic in some parts of Nigeria. The disease alert and outbreak threshold are known; however, there has been a shift from the previous seasonal transmission pattern to an all year-round transmission. The aim of this study was to carry out the analysis on LF and highlight the magnitude of the disease over a five-year period. We described data on Lassa fever and highlighted the magnitude of the disease over a five-year period. We conducted a secondary data analysis of LF with specific surveillance data from the NCDC for five years period (January 2019 to June 2023). A total of 29347 suspected cases were reported within the study period; of these, 4469 were confirmed cases, 861 were dead cases by NCDC. However, highest percentage for the case fatality rate/ratio was recorded in the year 2019 with 20.9% and lowest was recorded in the year 2023 with 17.3%. The highest percentage case positive rate was recorded in the year 2023 with 18.7% and lowest was recorded in the year 2021 with 11.0%. Keywords: Lassa fever; NCDC; epidemiological trends; suspected cases; case fatality rate. Review Article