The Lassa fever outbreak claimed 40 lives in January 2022.
The Nigeria Centre for Disease Control (NCDC) has disclosed this in a situation report on Sunday.
The centre said the 40 deaths represented a case fatality rate (CFR) of 19.0 percent lower than the CFR for the same period in 2021 which was 22.2 percent.
The NCDC report also showed that 211 cases of the disease were recorded out of a total of 981 suspected cases.
The health agency said in total, 14 states had recorded at least one confirmed case across 43 local government areas, with 82 percent from Ondo, Edo and Bauchi States.