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List of Ebola outbreaks

Summary

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.[1] 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).[2][3][4][5] 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.[6][7] RESTV has caused subclinical infections in humans, producing an antibody response but no visual symptoms or disease state manifestations.[8]

Ebola virus (SEM)

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,[9] or duiker.[10] The virus then spreads person-to-person, especially within families, in hospitals, and during some mortuary rituals where contact among individuals becomes more likely.[11]

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.[12] Outbreaks are also closely monitored by the United States Centers for Disease Control and Prevention (CDC) Special Pathogens Branch.[13]

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.[14][15][16]

Events edit

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.[17] For a complete overview, those cases are included below with footnotes and supporting sources.

Major or massive cases edit

Date Country[a] Virus Human cases Human deaths Case fatality rate Description
Jun–Nov 1976   Sudan 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.[18]
Aug 1976   Zaire 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.[19]
Aug–Sep 1979   Sudan SUDV 34 22 65% Occurred in Nzara and Maridi. This was a recurrent outbreak at the same site as the 1976 Sudan epidemic.[20]
Dec 1994–Feb 1995   Gabon 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.[21]
May–Jul 1995   Zaire 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.[22][23]
Jan 1996–Mar 1997   Gabon 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.[21]

The last strain Occurred in the Booué area with transport of patients to Libreville. The index case-patient was a hunter who lived in a forest timber camp. The disease was spread by close contact with infected persons. A dead chimpanzee found in the forest at the time was determined to be infected.[21]

Oct 2000–Jan 2001   Uganda 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.[24] Victims included Matthew Lukwiya.
Oct 2001–Dec 2003   Gabon
  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.[25]

The second strain Occurred in the districts of Mbomo and Kelle in the Cuvette-Ouest Department.[26]

The third strain Occurred in Mbomo and Mbandza villages, located in Mbomo District in the Cuvette-Ouest Department.[27]

Apr–Jun 2004   Sudan 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.[28]
Apr-May 2005   ROC EBOV 12 10 83% Occurred in the Etoumbi district of Cuvette Ouest Department of the Republic of the Congo[29]
Aug–Nov 2007   DRC EBOV 264 187 71%
Dec 2007–Jan 2008   Uganda BDBV 149 37 25% Occurred in the Bundibugyo District in western Uganda. This was the first identification of the Bundibugyo virus (BDBV).[3][4]
Dec 2008–Feb 2009   DRC EBOV 32 14 45% Occurred in the Mweka and Luebo health zones of the Kasaï-Occidental province.[30]
Jun–Aug 2012   Uganda SUDV 24 17 71% Occurred in the Kibaale District.[31]
Jun–Nov 2012   DRC BDBV 57 29 51% Occurred in the Orientale Province.[1][32]
Dec 2013–Jun 2016 Widespread:
  Liberia
  Sierra Leone
  Guinea
Limited and local:
  Nigeria
  Mali
  United States
  Senegal
  Spain
  United Kingdom
  Italy 		EBOV 28,616 11,310 70–71% (general)[33][34][35][note 1]
57–59% (among hospitalized patients)[36]		 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.[37][38][33] Flare-ups of the disease continued into 2016,[39] and the outbreak was declared over on 9 June 2016.
Aug–Nov 2014   DRC EBOV 66[40] 49[40] 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.[40][41] Declared over on 15 November 2014.[42]
May–Jul 2018   DRC EBOV 54 33 61%

On 8 May 2018, the government of the Democratic Republic of the Congo reported two confirmed cases of Ebola infection in the northwestern town of Bikoro.[43] On 17 May, a case was confirmed in the city of Mbandaka.[44] Health authorities were planning to ring vaccinate with rVSV-ZEBOV, a recently developed experimental Ebola vaccine, to contain the outbreak.[44][45] The outbreak was ongoing as of 24 June 2018, in 2014 a different area of Equateur province was affected[46][47] On 24 July 2018 the outbreak was declared over.[48][49][50][51]

Aug 2018–Jun 2020 Widespread:
  DRC
Limited and local:
  Uganda 		EBOV 3,470[52][53] 2,280[52][53] 66%

On 1 August 2018, the Democratic Republic of the Congo Ministry of Health declared an outbreak when 4 individuals tested positive for the Ebola virus.[54][55][56][57] On 11 June 2019, the WHO confirmed that a five-year-old boy in Uganda died after being diagnosed with Ebola.[58][59] On 25 June 2020, the second biggest EVD outbreak ever was declared over.[60]

May 2020–Nov 2020   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).[61][62][63] By 17 October 2020, the case count was 128 with 53 fatalities.[64]

By 18 November 2020, the World Health Organization and the Congolese government had not received reports of any cases of Ebola in Équateur province or all of the DRC for 42 days.[65] When the outbreak was declared over, there were 130 reported cases and 55 reported fatalities due to the virus.[66]

Feb–May 2021   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.[67] By 3 May 2021, the outbreak was declared over.[68]
Feb–Jun 2021   Guinea EBOV 23 12 52% First Ebola cases and deaths in the country since 2016.[67][69] 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.[70] 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.[71] The outbreak was declared over on 19 June 2021.[72]
Oct–Dec 2021   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.[73] On 16 December the outbreak was declared over.[74]
Sept 2022–Jan 2023   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.[75]

Minor or single cases edit

Date Country[a] Virus Human cases Human deaths Description
1976   United Kingdom SUDV or EBOV[note 2] 1 0 Laboratory infection by accidental stick of contaminated needle.[76][77]
1977   Zaire EBOV 1 1 Noted retroactively in the village of Tandala.[77][78][79]
1989–1990   Philippines RESTV 3[b] 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.[80] Three workers in the facility developed antibodies to the virus but did not get sick.[81]
1989   United States RESTV 0 0 RESTV was introduced into quarantine facilities in Virginia and Pennsylvania by monkeys imported from the Philippines. No human cases were reported.[82]
1990   United States RESTV 4[b] 0 Monkeys imported from the Philippines introduced RESTV into quarantine facilities in Virginia and Texas. Four humans developed antibodies but did not get sick.[83]
1992   Italy 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.[84]
1994   Côte d'Ivoire[c] TAFV 1 0 This case was the first and thus far only recognition of Taï Forest virus (TAFV). Approximately one week after conducting necropsies on infected western chimpanzees in Taï National Park, a scientist contracted the virus and developed symptoms similar to those of dengue fever. She was discharged from a Swiss hospital two weeks later and fully recovered after six weeks.[85]
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.[86][87]
1996   South Africa EBOV 1 1 n/a
1996   United States 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.[88]
1996   Philippines RESTV 0 0 RESTV was identified at a monkey export facility in the Philippines. No human cases resulted.[89]
1996   Russia EBOV 1 1 Laboratory contamination.[90]
2004   Russia EBOV 1 1 Laboratory contamination.[91]
2008   Philippines RESTV 6[b] 0 First recognition of RESTV in pigs. Strain very similar to earlier strains. Occurred in November. Six workers from the pig farm and slaughterhouse developed antibodies but did not become sick.[92][93]
2011   Uganda SUDV 1 1 n/a[citation needed]
2012   Uganda SUDV 7 4 n/a [citation needed]
2015   Philippines 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.[94]
2017   DRC EBOV 8 4

On 11 May 2017, the Ministry of Public Health for the Democratic Republic of the Congo notified the WHO of an Ebola outbreak in the Likati health zone (LHZ) in Bas-Uele province, in the northern part of the country. Suspected infections were reported from Nambwa, Mouma, and Ngay. The LHZ borders the Central African Republic, which made this outbreak a moderate risk to the region.[95][96]

2018   Hungary 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.[97][98]
2022   DRC EBOV 5 5 An outbreak in DRC began on April 23, and has killed 100% of those infected.[99]
2022   DRC EBOV 1 1 A single case was confirmed in North Kivu.[100]

List of other Filoviridae outbreaks edit

Marburg virus disease outbreaks[101]
Year Country[a] Virus Human cases Human deaths Case fatality rate Comments
1967   West Germany
  Yugoslavia 		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[102]
1975   Rhodesia
  South Africa 		MARV 3 1 33% Individual had traveled to Zimbabwe[101]
1980   Kenya MARV 2 1 50% Individual(s) traveled to Kitum Cave[101]
1987   Kenya RAVV 1 1 100% Ravn virus (RAVV) one of two members of the species Marburg marburgvirus[103]
1990   Soviet Union MARV 1 1 100% Laboratory incident[101]
1998–2000   DRC MARV & RAVV 154 128 83% Occurred in Durba[101]
2004–2005   Angola MARV 252 227 90% Largest Marburg virus outbreak ever occurred in Angola[104]
2007   Uganda MARV & RAVV 4 1 25% Occurred in Kamwenge[101]
2008   Uganda
  Netherlands
  United States 		MARV 2 1 50%               -
2012   Uganda MARV 15 4 27% Occurred in Kabale[101]
2014   Uganda MARV 1 1 100%               -
2017   Uganda MARV 3 3 100% Uganda has had five outbreaks of the virus[105]
2021   Guinea 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.[106] This is the first-ever case of the Marburg virus disease in West Africa.[107] On August 2, the patient succumbed to the illness.[108]
2022   Ghana MARV 3 3 100% First time Ghana has had cases of Marburg virus disease[109][110]
2023   Equatorial Guinea MARV 17 12 70%

First time Marburg virus disease was detected in the country.

2023   Tanzania MARV 9 6 67% First time Marburg virus disease was detected in the country.[111][112]

See also edit

Notes edit

  1. ^ a b c In accordance with the sovereignty at the time.
  2. ^ a b c All cases were asymptomatic.
  3. ^ The case was repatriated to Switzerland for medical treatment.[85]
  1. ^ The mortality rate (death/case ratio) recorded in Liberia up to 26 August 2014 was 70 percent.[34] However, the general estimated case fatality rate (70.8 percent) for this ongoing epidemic differs from the ratio of the number of deaths divided by that of cases due to the estimation method used. Current infections have not run their course, and the estimate may be poor if reporting is biased towards severe cases.
  2. ^ The Centers for Disease Control chronology notes this infection as "Sudan virus", whereas the 1977 British Medical Journal (BMJ) article refers to it as "Ebola virus". In 1977, there was no distinction between different ebolaviruses. The BMJ article notes only that the patient received "convalescent serum from the Sudan" following similar serum from Zaire

References edit

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Further reading edit

  • de Meneses Rocha Pacheco, Daniela Alexandra; Rodrigues, Acácio Agostinho Gonçalves; da Silva, Carmen Maria Lisboa (August 2016). "Ebola virus – from neglected threat to global emergency state" (PDF). Revista da Associação Médica Brasileira. 62 (5). Associação Médica Brasileira: 458–467. doi:10.1590/1806-9282.62.05.458. ISSN 1806-9282. PMID 27656857. S2CID 9073931 – via SciELO.
  • Park, Sung-Joon (March 2021). "Deadly secret: situating the unknowing and knowing of the source of the Ebola epidemic in Northern Uganda". Journal of the Royal Anthropological Institute. 27 (2). Wiley-Blackwell on behalf of the Royal Anthropological Institute: 227–244. doi:10.1111/1467-9655.13488. ISSN 1467-9655. S2CID 233606310.

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