Nigeria's lassa fever outbreak kills 252, CFR rises to 24.4%
Nigeria's lassa fever outbreak has caused 252 deaths among 1,035 confirmed cases as of epidemiological week 33, giving a case fatality rate of 24.4 percent. Fourteen new confirmed cases were reported between August 10 and 16, up from four the prior week, bringing suspected cases to 7,426 and six probable cases. Five states—Ondo, Bauchi, Taraba, Edo and Benue—account for 87 percent of confirmed cases, with Ondo alone at 33 percent. The median patient age is 30 years, and 54 healthcare workers have been affected; authorities cite late presentation, treatment cost and sanitation as challenges.
Lassa fever case fatality rate in Nigeria reached 24.4 percent.
Context
Lassa cases and deaths rose compared with the same period in 2025. Health authorities have increased surveillance and protection efforts and may expand response if cases keep rising.
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