Ebola Virus Disease Outbreaks: Historical Timeline and Current Status
Ebola virus disease (EVD) outbreaks have occurred sporadically since the virus was first identified in 1976. All known outbreaks have been in Africa.
Historical Outbreak Summary (WHO Data)
| Year | Country | Species | Cases | Deaths | CFR |
|---|
| 1976 | DRC (Yambuku) | Zaire ebolavirus | 318 | 280 | 88% |
| 1976 | Sudan (Nzara) | Sudan ebolavirus | 284 | 151 | 53% |
| 1995 | DRC (Kikwit) | Zaire | 315 | 250 | 81% |
| 2000–01 | Uganda (Gulu) | Sudan | 425 | 224 | 53% |
| 2007 | DRC (Kasai Occidental) | Zaire | 264 | 187 | 71% |
| 2014–16 | West Africa (Guinea, Liberia, Sierra Leone) | Zaire | 28,616 | 11,310 | 40% |
| 2018–20 | DRC (North Kivu/Ituri) | Zaire | 3,470 | 2,287 | 66% |
| 2021 | DRC (North Kivu) | Zaire | 12 | 6 | 50% |
| 2022 | DRC (Equateur) | Zaire | 5 | 5 | 100% |
| 2023 | Uganda | Sudan | 164 | 77 | 47% |
Key Developments
- Vaccines: rVSV-ZEBOV (Ervebo) — Merck, WHO-prequalified 2019. Ring vaccination strategy. Ad26.ZEBOV/MVA-BN-Filo (Zabdeno/Mvabea) — Janssen, 2-dose.
- Therapeutics: mAb114 (Ansuvimab/Ebanga), REGN-EB3 (Inmazeb) — monoclonal antibodies, FDA-approved 2020. Reduce mortality to ~30% if given early.
- Diagnostics: Rapid antigen tests (ReEBOV), GeneXpert Ebola assay.
- Survivor care: Persistent virus in immune-privileged sites (semen, aqueous humor, CSF); sequelae (arthralgia, uveitis, neurocognitive).
Current Status (2024)
- No active outbreaks as of mid-2024.
- Endemic risk persists in Central/West Africa (zoonotic reservoir: fruit bats).
- Preparedness: WHO Ebola readiness framework, national contingency plans, stockpiled vaccines/therapeutics.
Total documented outbreaks since 1976: ~35–40 (varies by counting criteria). The 2014–16 West Africa epidemic transformed global response capacity and accelerated countermeasure development.
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