The Nigeria Centre for Disease Control and Prevention, NCDC, says 1,119 confirmed cases of Lassa fever were recorded in 2025, with young adults emerging as the most affected age group nationwide.
The agency disclosed this in its Lassa Fever Situation Report for Epidemiological Week 51, covering December 15 to 21, 2025, providing a comprehensive overview of cases, deaths, and affected states across the country.
According to the report, people aged 21 to 30 years accounted for the highest burden of confirmed infections, with the median age among patients recorded at 30 years nationwide.
The NCDC noted that males were slightly more affected than females, reflecting gender differences in exposure or health-seeking behaviour in communities with high Lassa fever transmission risk.
So far, 206 deaths have been recorded among confirmed cases, representing a case fatality rate of 18.4 per cent, higher than the 16.4 per cent reported during the same period in 2024.
