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Lassa fever

Lassa Fever Outbreak in Nigeria: Key Trends and Developments

Strategic Insights

— 1 min read

The Nigeria Centre for Disease Control (NCDC) has confirmed eight new cases of Lassa fever between June 9th and 15th, raising the total number of confirmed infections to 766 this year. Two additional deaths were recorded, bringing the national fatality toll to 145. The new cases emerged from Edo, Ondo, Taraba, and Ebonyi States, with a significant decrease in suspected and confirmed cases compared to the same period last year. The current Case Fatality Rate (CFR) stands at 18.9 percent, an increase from 17.6 percent observed in 2024.

Key Takeaways:

  • The total number of confirmed Lassa fever cases in 2025 stands at 766, with 18 states across 96 Local Government Areas reporting at least one confirmed case.
  • The majority of confirmed cases originated from just five states: Ondo (31%), Bauchi (24%), Edo (17%), Taraba (16%), and Ebonyi (3%).
  • The most affected age group is 21 to 30 years, with a median age of 30 years, and the male-to-female ratio among confirmed cases stands at 1:0.8.
  • The current Case Fatality Rate (CFR) is 18.9 percent, an increase from 17.6 percent observed in 2024.
  • A significant decline was observed in both suspected and confirmed cases compared to the same period last year.
  • No healthcare workers were infected during the reporting week, according to the NCDC.
  • The National Lassa Fever Multi-Partner, Multi-Sectoral Incident Management System (IMS) remains fully activated to coordinate response efforts.

Statistics:

  • 766 total confirmed Lassa fever cases in 2025
  • 18 states across 96 Local Government Areas have reported at least one confirmed case
  • 91 percent of all confirmed Lassa fever cases originated from just five states: Ondo, Bauchi, Edo, Taraba, and Ebonyi
  • 19 deaths have been reported in Edo State, 28 in Ondo State, 24 in Bauchi, 22 in Taraba, and 3 in Ebonyi
  • 145 total deaths have been reported with a Case Fatality Rate (CFR) of 18.9 percent
  • No healthcare workers were infected during the reporting week

Sources:

  • NCDC Lassa Fever Situation Report (Exact reference not provided)

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