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List of Ebola outbreaks
Cases and outbreaks of Ebola virus disease
Cases and outbreaks of Ebola virus disease
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This list of Ebola outbreaks records the known occurrences of Ebola virus disease, a highly infectious and acutely lethal viral disease that has afflicted humans and animals primarily in equatorial Africa. The pathogens responsible for the disease are the five ebolaviruses recognized by the International Committee on Taxonomy of Viruses: Ebola virus (EBOV), Sudan virus (SUDV), Reston virus (RESTV), Taï Forest virus (TAFV), and Bundibugyo virus (BDBV). Four of the five variants have caused the disease in humans as well as other animals; RESTV has caused clinical symptoms only in non-human primates. RESTV has caused subclinical infections in humans, producing an antibody response but no visual symptoms or disease state manifestations.
Transmission of the ebolaviruses between natural reservoirs and humans is rare, and outbreaks of Ebola virus disease are often traceable to a single case where an individual has handled the carcass of a gorilla, chimpanzee, bats, or duiker. The virus then spreads person-to-person, especially within families, in hospitals, and during some mortuary rituals where contact among individuals becomes more likely.
Learning from failed responses, such as during the 2000 outbreak in Uganda, the World Health Organization (WHO) established its Global Outbreak Alert and Response Network, and other public health measures were instituted in areas at high risk. Field laboratories were established to confirm cases, instead of shipping samples to South Africa. Outbreaks are also closely monitored by the United States Centers for Disease Control and Prevention (CDC) Special Pathogens Branch.
Nigeria was the first country in western Africa to successfully curtail the virus, and its procedures have served as a model for other countries to follow.
Events
The information in the following tables comes from the World Health Organization (WHO). This data excludes all laboratory personnel cases, Reston virus cases (since they are all asymptomatic), and suspected cases. For a complete overview, those cases are included below with footnotes and supporting sources.
Major or massive cases
| Date | Country | Virus | Human cases | Human deaths | Case fatality rate | Description | |||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jun–Nov 1976 | SUDV | 284 | 151 | 53% | Occurred in Nzara (the source town), Maridi, Tumbura, and Juba (cities in present-day South Sudan). The index cases were workers in a cotton factory. The disease was spread by close contact with an acute case, usually from patients to their nurses. Many medical care personnel were infected. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Aug 1976 | EBOV | 318 | 280 | 88% | Occurred in Yambuku and surrounding areas in what was then Zaire (present-day Democratic Republic of the Congo DRC). It spread through personal contact and by use of contaminated needles and syringes in hospitals and clinics. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Aug–Sep 1979 | SUDV | 34 | 22 | 65% | Occurred in Nzara and Maridi. This was a recurrent outbreak at the same site as the 1976 Sudan epidemic. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Dec 1994–Feb 1995 | EBOV | 52 | 31 | 60% | Occurred in Makokou and gold-mining camps deep in the rainforest along the Ivindo River. Until 1995, the outbreak was incorrectly classified as yellow fever. | ||||||||||||||||||||||||||||||||||||||||||||||||
| May–Jul 1995 | EBOV | 315 | 254 | 81% | Occurred in Kikwit and surrounding areas. The outbreak was traced to a patient who worked in a forest adjoining the city. The epidemic spread through families and hospital admissions. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Jan 1996–Mar 1997 | EBOV | 91 | 66 | 72.53% | The first strain Occurred in the village of Mayibout 2 and neighboring areas. A chimpanzee found dead in the forest was eaten by villagers hunting for food. Nineteen people involved in the butchery of the animal became ill, and other cases occurred in their family members. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Oct 2000–Jan 2001 | SUDV | 425 | 224 | 53% | Occurred in the Gulu, Masindi, and Mbarara districts of Uganda. The three greatest risks associated with Sudan virus infection were attending funerals of case-patients, having contact with case-patients in one's family, and providing medical care to case-patients without using adequate personal protective measures. Victims included Matthew Lukwiya. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Oct 2001–Dec 2003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Republic of the Congo ROC | EBOV | 302 | 254 | 84.11% | The first strain Occurred on both sides of the border between Gabon and the Republic of the Congo (RC). This outbreak included the first reported occurrence of Ebola virus disease in the RC. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Apr–Jun 2004 | SUDV | 17 | 7 | 41% | Occurred in Yambio county in Western Equatoria of southern Sudan (present-day South Sudan). This outbreak was concurrent with an outbreak of measles in the same area, and several suspected EVD cases were reclassified later as measles cases. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Apr-May 2005 | Republic of the Congo ROC | EBOV | 12 | 10 | 83% | Occurred in the Etoumbi district of Cuvette Ouest Department of the Republic of the Congo | |||||||||||||||||||||||||||||||||||||||||||||||
| Aug–Nov 2007 | Democratic Republic of the Congo DRC | EBOV | 264 | 187 | 71% | Outbreak was declared in September in Luebo and Mweke health zones of the Kasaï-Occidental province. | |||||||||||||||||||||||||||||||||||||||||||||||
| Dec 2007–Jan 2008 | BDBV | 149 | 37 | 25% | last1=Towner | first1=J. S. | last2=Sealy | first2=T. K. | last3=Khristova | first3=M. L. | last4=Albariño | first4=C. S. G. | last5=Conlan | first5=S. | last6=Reeder | first6=S. A. | last7=Quan | first7=P. L. | last8=Lipkin | first8=W. I. | last9=Downing | first9=R. | last10=Tappero | first10=J. W. | last11=Okware | first11=S. | last12=Lutwama | first12=J. | last13=Bakamutumaho | first13=B. | last14=Kayiwa | first14=J. | last15=Comer | first15=J. A. | year=2008 | editor1-last=Basler | editor1-first=Christopher F. | title=Newly Discovered Ebola Virus Associated with Hemorrhagic Fever Outbreak in Uganda | journal=PLOS Pathogens | volume=4 | issue=11 | article-number=e1000212 | doi=10.1371/journal.ppat.1000212 | pmc=2581435 | pmid=19023410 | doi-access=free | last16=Rollin | first16=P. E. | last17=Ksiazek | first17=T. G. | last18=Nichol | first18=S. T.}} | |
| Dec 2008–Feb 2009 | Democratic Republic of the Congo DRC | EBOV | 32 | 14 | 45% | Occurred in the Mweka and Luebo health zones of the Kasaï-Occidental province. | |||||||||||||||||||||||||||||||||||||||||||||||
| Jun–Aug 2012 | SUDV | 24 | 17 | 71% | Occurred in the Kibaale District. | ||||||||||||||||||||||||||||||||||||||||||||||||
| Jun–Nov 2012 | Democratic Republic of the Congo DRC | BDBV | 57 | 29 | 51% | author=Centers For Disease Control | title=Outbreak Postings | url=https://www.cdc.gov/vhf/ebola/resources/outbreaks.html#nov-2012-congo | access-date=2014-07-11 | publisher=Centers for Disease Control | archive-date=16 May 2019 | archive-url=https://web.archive.org/web/20190516032258/https://www.cdc.gov/vhf/ebola/resources/outbreaks.html#nov-2012-congo | url-status=live }} | ||||||||||||||||||||||||||||||||||||||||
| Dec 2013–Jun 2016 | Widespread: | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Limited and local: | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| EBOV | 28,616 | 11,310 | author=WHO Ebola Response Team | date=23 September 2014 | title=Ebola Virus Disease in West Africa – The First 9 Months of the Epidemic and Forward Projections | journal=New England Journal of Medicine | volume=371 | issue=16 | pages=1481–1495 | doi=10.1056/NEJMoa1411100 | pmc=4235004 | pmid=25244186}} | |||||||||||||||||||||||||||||||||||||||||
| 57–59% (among hospitalized patients) | This was the most severe Ebola outbreak in recorded history in regards to both the number of human cases and fatalities. It began in Guéckédou, Guinea, in December 2013 and spread abroad. Flare-ups of the disease continued into 2016, and the outbreak was declared over on 9 June 2016. | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aug–Nov 2014 | Democratic Republic of the Congo DRC | EBOV | 66 | 49 | 74% | Occurred in Équateur province. Outbreak detected 24 August and, as of 28 October 2014, the WHO said that twenty days had passed since the last reported case was discharged and no new contacts were being followed. Declared over on 15 November 2014. | |||||||||||||||||||||||||||||||||||||||||||||||
| May–Jul 2018 | Democratic Republic of the Congo DRC | EBOV | 54 | 33 | 61% | ||||||||||||||||||||||||||||||||||||||||||||||||
| Aug 2018–Jun 2020 | Widespread: | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Democratic Republic of the Congo DRC | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Limited and local: | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| EBOV | title=Operations Dashboard for ArcGIS | url=https://who.maps.arcgis.com/apps/opsdashboard/index.html#/e70c3804f6044652bc37cce7d8fcef6c | access-date=20 February 2020 | website=who.maps.arcgis.com | archive-date=21 August 2019 | archive-url=https://web.archive.org/web/20190821210526/https://who.maps.arcgis.com/apps/opsdashboard/index.html#/e70c3804f6044652bc37cce7d8fcef6c | url-status=live }} | 2,280 | 66% | ||||||||||||||||||||||||||||||||||||||||||||
| May 2020–Nov 2020 | Democratic Republic of the Congo DRC | EBOV | 130 | 55 | 42% | On 31 May 2020, the DRC Health Minister Eteni Longondo announced an additional Ebola outbreak, separate to the ongoing Kivu Ebola epidemic. The outbreak originated in Équateur province (which was also the location of the [2018 Équateur province Ebola outbreak](2018-equateur-province-ebola-outbreak)). By 17 October 2020, the case count was 128 with 53 fatalities. | |||||||||||||||||||||||||||||||||||||||||||||||
| Feb–May 2021 | Democratic Republic of the Congo DRC | EBOV | 12 | 6 | 50% | On 6 February 2021, an outbreak was declared in Butembo in the North Kivu province by the Ministry of Public Health of the Democratic Republic of the Congo. By 3 May 2021, the outbreak was declared over. | |||||||||||||||||||||||||||||||||||||||||||||||
| Feb–Jun 2021 | EBOV | 23 | 12 | 52% | last=Maddipatla | first=Manojna | date=1 March 2021 | title=Three new Ebola cases confirmed in Congo, two in Guinea | url=https://www.metro.us/three-new-ebola-cases/ | access-date=2 March 2021 | website=metro | archive-date=1 March 2021 | archive-url=https://web.archive.org/web/20210301234916/https://www.metro.us/three-new-ebola-cases/ | url-status=live }} The first cases were confirmed on 14 February 2021, and by 9 April 2021, there were 23 reported cases of the virus, with 12 fatalities and 9 recoveries. Scientists concluded that the likely source of the outbreak was a man who had survived the 2013-2016 West African epidemic but had unknowingly harbored the Ebola virus in his body, eventually transmitting it to somebody in his community, although the first known case of this current outbreak was a female nurse who had died on 28 January 2021. The outbreak was declared over on 19 June 2021. | |||||||||||||||||||||||||||||||||||||||
| Oct–Dec 2021 | Democratic Republic of the Congo DRC | EBOV | 11 | 9 | 82% | On 8 October 2021, the Ministry of Public Health for the Democratic Republic of the Congo reported a new laboratory confirmed case of Ebola virus disease, ten more related cases were later confirmed. On 16 December the outbreak was declared over. | |||||||||||||||||||||||||||||||||||||||||||||||
| Sept 2022–Jan 2023 | Uganda UGA | SUDV | 164 | 77 | 47% | On 20 September 2022 an outbreak was declared in Mubende District, Uganda. Seventy-seven people died, with a total of 164 cases detected. The outbreak was declared over in January 2023. | |||||||||||||||||||||||||||||||||||||||||||||||
| Feb–Apr 2025 | Uganda UGA | SUDV | 14 | 4 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Aug 2025–Dec 2025 | Democratic Republic of the Congo DRC | EBOV | 81 | 28 |
Minor or single cases
| Date | Country | Virus | Human cases | Human deaths | Description | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1976 | SUDV or EBOV | 1 | 0 | Laboratory infection by accidental stick of contaminated needle. | |||||||||||||||||||||
| 1977 | EBOV | 1 | 1 | last1=Heymann | first1=D. L. | last2=Weisfeld | first2=J. S. l | last3=Webb | first3=P. A. | last4=Johnson | first4=K. M. | last5=Cairns | first5=T. | last6=Berquist | first6=H. | year=1980 | title=Ebola hemorrhagic fever: Tandala, Zaire, 1977–1978 | journal=Journal of Infectious Diseases | volume=142 | issue=3 | pages=372–376 | doi=10.1093/infdis/142.3.372 | pmid=7441008}} | ||
| 1989–1990 | Philippines | RESTV | 3 | 0 | The Reston virus (RESTV) was first identified when it caused high mortality in crab-eating macaques in a primate research facility responsible for exporting animals to the United States. Three workers in the facility developed antibodies to the virus but did not get sick. | ||||||||||||||||||||
| 1989 | RESTV | 0 | 0 | RESTV was introduced into quarantine facilities in Virginia and Pennsylvania by monkeys imported from the Philippines. No human cases were reported. | |||||||||||||||||||||
| 1990 | RESTV | 4{{efn | name=two}} | 0 | |||||||||||||||||||||
| 1992 | RESTV | 0 | 0 | RESTV was introduced into quarantine facilities in Siena by monkeys imported from the same facility in the Philippines that was the source of the 1989 and 1990 U.S. outbreaks. No human cases resulted. | |||||||||||||||||||||
| 1994 | Côte d'Ivoire | TAFV | 1 | 0 | last1=Le Guenno | first1=B. | last2=Formenty | first2=P. | last3=Wyers | first3=M. | last4=Gounon | first4=P. | last5=Walker | first5=F. | last6=Boesch | first6=C. | year=1995 | title=Isolation and partial characterisation of a new strain of Ebola virus | journal=Lancet | volume=345 | issue=8960 | pages=1271–1274 | doi=10.1016/S0140-6736(95)90925-7 | pmid=7746057 | s2cid=38897209}} |
| 1995 | Côte d'Ivoire | Unknown | 1 | 0 | One person, fleeing the civil war in neighboring Liberia, was identified as an Ebola case in Gozon. This is considered as a suspected case, excluding from the WHO outbreak counts. | ||||||||||||||||||||
| 1996 | EBOV | 1 | 1 | n/a | |||||||||||||||||||||
| 1996 | RESTV | 0 | 0 | RESTV was again introduced into a quarantine facility in Texas by monkeys imported from the same facility in the Philippines that was the source of the 1989 and 1990 U.S. outbreaks. No human cases resulted. | |||||||||||||||||||||
| 1996 | Philippines | RESTV | 0 | 0 | RESTV was identified at a monkey export facility in the Philippines. No human cases resulted. | ||||||||||||||||||||
| 1996 | EBOV | 1 | 1 | Laboratory contamination. | |||||||||||||||||||||
| 2004 | EBOV | 1 | 1 | Laboratory contamination. | |||||||||||||||||||||
| 2008 | RESTV | 6{{efn | name=two}} | 0 | |||||||||||||||||||||
| 2011 | SUDV | 1 | 1 | A 12 year old girl from Luwero District in central Uganda. | |||||||||||||||||||||
| 2012 | SUDV | 7 | 4 | Occurred in the Luweero and Kampala districts of Uganda in November and December 2012 | |||||||||||||||||||||
| 2015 | RESTV | 0 | 0 | On 6 September 2015, the Philippine health secretary reported an outbreak of RESTV in a primate research and breeding facility. Twenty-five workers subsequently tested negative for the virus. | |||||||||||||||||||||
| 2017 | Democratic Republic of the Congo DRC | EBOV | 8 | 4 | |||||||||||||||||||||
| 2018 | N/A | 0 | 0 | On 20 April 2018, a laboratory accident led to a single worker being exposed to the Ebola virus, though he did not develop symptoms. | |||||||||||||||||||||
| 2022 | Democratic Republic of the Congo DRC | EBOV | 5 | 5 | An outbreak in DRC began on April 23, and has killed 100% of those infected. | ||||||||||||||||||||
| 2022 | Democratic Republic of the Congo DRC | EBOV | 1 | 1 | A single case was confirmed in North Kivu. |
List of other Filoviridae outbreaks
| Year | Country | Virus | Human cases | Human deaths | Case fatality rate | Comments |
|---|---|---|---|---|---|---|
| 1967 | ||||||
| MARV | 31 | 7 | 23% | In 1967 outbreaks in Marburg, Germany where the virus was first identified (historically) and the subsequent naming of the virus per the location | ||
| 1975 | Rhodesia | |||||
| South Africa | MARV | 3 | 1 | 33% | Individual had traveled to Zimbabwe | |
| 1980 | MARV | 2 | 1 | 50% | Individual(s) traveled to Kitum Cave | |
| 1987 | RAVV | 1 | 1 | 100% | Ravn virus (RAVV) one of two members of the species Marburg marburgvirus | |
| 1990 | MARV | 1 | 1 | 100% | Laboratory incident | |
| 1998–2000 | Democratic Republic of the Congo DRC | MARV & RAVV | 154 | 128 | 83% | Occurred in Durba |
| 2004–2005 | MARV | 252 | 227 | 90% | Largest Marburg virus outbreak ever occurred in Angola | |
| 2007 | MARV & RAVV | 4 | 1 | 25% | Occurred in Kamwenge | |
| 2008 | ||||||
| MARV | 2 | 1 | 50% | - | ||
| 2012 | MARV | 15 | 4 | 27% | Occurred in Kabale | |
| 2014 | MARV | 1 | 1 | 100% | - | |
| 2017 | MARV | 3 | 3 | 100% | Uganda has had five outbreaks of the virus | |
| 2021 | MARV | 1 | 1 | 100% | In August 2021, two months after the re-emergent Ebola epidemic in the Guéckédou prefecture was declared over, a case of the Marburg virus disease was confirmed by health authorities through laboratory analysis. This is the first-ever case of the Marburg virus disease in West Africa. On August 2, the patient succumbed to the illness. | |
| 2022 | MARV | 3 | 3 | 100% | ||
| 2023 | MARV | 17 | 12 | 70% | ||
| 2023 | MARV | 9 | 6 | 67% | ||
| 2024 | MARV | 66 | 15 | 23% | ||
| 2025 | MARV | 14 | 9 | 64% |
Notes
References
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