Lassa Fever Outbreak in Nigeria: 747 Confirmed Cases and 142 Casualties Reported

As of May 26-June 1, 2025, Nigeria has reported 747 confirmed cases of Lassa Fever, resulting in 142 casualties. The outbreak has been reported across 18 states, with 96 Local Government Areas affected. The Nigeria Centre for Disease Control and Prevention (NCDC) has published a Situation Report for Week 22, highlighting the current state of the outbreak and the need for public health coverage and reporting.

Key Takeaways:

• 747 confirmed cases of Lassa Fever have been reported in Nigeria as of Week 22, 2025.
• 142 deaths have been reported, with a Case Fatality Rate (CFR) of 19.0 percent, higher than the 18.1 percent recorded in 2024.
• The outbreak has been reported across 18 states, with 96 Local Government Areas affected.
• 91 percent of cases have been reported from five states: Ondo, Bauchi, Edo, Taraba, and Ebonyi.
• The predominant age group affected is 21-30 years, with a range of 1 to 96 years and a median age of 30 years old.
• No new healthcare worker was affected in the reporting week, and all cases were reported in patients.
• The CFR for the same period in 2024 was 18.1 percent.

Statistics:

• 747 confirmed cases of Lassa Fever have been reported as of Week 22, 2025.
• 142 deaths have been reported, with a CFR of 19.0 percent.
• 91 percent of cases have been reported from five states.
• 18 states have recorded at least one confirmed case across 96 Local Government Areas.
• The predominant age group affected is 21-30 years (Range: 1-96 years, Median Age: 30 years).
• No new healthcare worker was affected in the reporting week.

Sources:

• Nigeria Centre for Disease Control and Prevention (NCDC). (2025, Week 22). Lassa Fever Situation Report for Week 22 (May 26-June 1).