The cumulative number of confirmed Lassa fever cases across Nigeria in January-April 2025 was 674, with 127 deaths, representing a mortality rate of 18.8%, a slight increase from the same period in 2024 (18.5%). The outbreak covers 21 of the 36 states in the country, and it is noteworthy that the youth group aged 21-30 years accounted for 45% of confirmed cases, with a significantly higher proportion of males (55%) infected than females, which is closely related to the more frequent exposure of males to rodents in rural areas as they are engaged in agricultural activities.
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