The Nigeria Centre for Disease Control and Prevention made this known in its Lassa fever situation report for week nine spanning January to March 5, 2023.
The report showed that the death toll had risen to 109, up from the previous 104.
With the current death toll, the agency noted that the case-fatality ratio of the outbreak stood at 16.1 per cent.
Of the 72 per cent confirmed cases, Ondo reported 33 per cent, Edo, 29 per cent, and Bauchi, 10 per cent.
According to the World Health Organisation, Lassa fever is an acute viral hemorrhagic illness caused by the Lassa virus, a member of the arenavirus family of viruses.
Humans usually become infected with the Lassa virus through exposure to food or household items contaminated with the urine or faeces of infected Mastomys rats. The disease is endemic in the rodent population in parts of West Africa.
Lassa fever is known to be endemic in Benin, Ghana, Guinea, Liberia, Mali, Sierra Leone, Togo, and Nigeria, but probably exists in other West African countries as well.
Poor environmental sanitation, poor awareness, and late presentation of cases are reported to fuel the epidemic in Nigeria.
“In week 9, the number of new confirmed cases decreased from 59 in week 8 2023 to 40 cases. These were reported from Bauchi, Ondo, Taraba, Edo, and Ebonyi States.
“Cumulatively, from week 1 to week 9, 2023, 109 deaths have been reported with a case fatality rate of 16.1 per cent, which is lower than the CFR for the same period in 2022 (18.6 per cent).
“The predominant age group affected is 21-30 years (range: 1 to 93 years, Median Age: 32 years). The male-to-female ratio for confirmed cases is 10.8.
“The number of suspected cases increased compared to that reported for the same period in 2022.
“One new Health care worker was affected in the reporting week nine,” the report read in part.