Rift Valley fever
Rift Valley fever clinical and global spread profile: 13 countries, 22 WHO outbreak events since 1998.
Rift Valley fever · ICD-10 A924 · ICD-11 1D44 · 22 WHO events across 13 countries (1998–2025).
Top affected countries
| Country | Region | Events | % of global |
|---|---|---|---|
| Kenya | AFR | 5 | 23% |
| Mauritania | AFR | 4 | 18% |
| South Africa | AFR | 2 | 9% |
| Sudan | EMR | 2 | 9% |
| China | WPR | 1 | 5% |
| France | EUR | 1 | 5% |
| Madagascar | AFR | 1 | 5% |
| Gambia | AFR | 1 | 5% |
| Yemen | EMR | 1 | 5% |
| Niger | AFR | 1 | 5% |
| Senegal | AFR | 1 | 5% |
| Tanzania United Republic of | AFR | 1 | 5% |
| Somalia | EMR | 1 | 5% |
Distribution by WHO region
| Region | Events | Share |
|---|---|---|
| AFR | 16 | 73% |
| EMR | 4 | 18% |
| WPR | 1 | 5% |
| EUR | 1 | 5% |
Annual outbreak timeline
| Year | Events | Countries |
|---|---|---|
| 2025 | 2 | 2 |
| 2022 | 1 | 1 |
| 2021 | 1 | 1 |
| 2020 | 1 | 1 |
| 2019 | 2 | 2 |
| 2018 | 2 | 2 |
| 2016 | 2 | 2 |
| 2012 | 1 | 1 |
| 2010 | 1 | 1 |
| 2008 | 2 | 2 |
| 2007 | 2 | 2 |
| 2006 | 1 | 1 |
| 2000 | 1 | 1 |
| 1999 | 1 | 1 |
| 1998 | 2 | 2 |
Peak year: 2025 (2 events).
Decade summary
| Decade | Events |
|---|---|
| 1990s | 3 |
| 2000s | 6 |
| 2010s | 8 |
| 2020s | 5 |
WHO case definition
A disease caused by an infection with Rift Valley fever virus. This disease is commonly asymptomatic. This disease may also present with fever, liver abnormalities, weakness, back pain, or dizziness. Transmission is through the bite of an infected mosquito. Confirmation is commonly by detection of Rift Valley fever virus specific IgM or IgG antibodies in a blood sample.
Countries Affected
13
Outbreak Events
22
Year Range
1998–2025
ICD-10 A924
Rift Valley fever
Visualization
Global Prevalence Snapshot
Based on WHO Disease Outbreak News events (1998–2025).
Risk Level
Continue exploring
