Western equine encephalitis
Western equine encephalitis clinical and global spread profile: 2 countries, 2 WHO outbreak events since 2023.
Western equine encephalitis · ICD-10 A831 · ICD-11 1C83 · 2 WHO events across 2 countries (2023–2024).
Top affected countries
| Country | Region | Events | % of global |
|---|---|---|---|
| Argentina | AMR | 1 | 50% |
| Uruguay | AMR | 1 | 50% |
WHO case definition
A disease which is a form of arboviral encephalitis (primarily affecting horses) endemic to western and central regions of North America. The causative organism (Encephalomyelitis virus, Western Equine) may be transferred to humans via the bite of mosquitoes (Culex tarsalis and others). Clinical manifestations include headache and influenza-like symptoms followed by alterations in mentation, seizures, and come. Death occurs in a minority of cases. Survivors may recover fully or be left with residual neurologic dysfunction, including parkinsonism, postencephalitic.
Countries Affected
2
Outbreak Events
2
Year Range
2023–2024
ICD-10 A831
Western equine encephalitis
Visualization
Global Prevalence Snapshot
Based on WHO Disease Outbreak News events (2023–2024).
Risk Level
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