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2014 Ebola Outbreak in West Africa

(Guinea, Liberia, Sierra Leone, and Nigeria)

Highlights

The 2014 Ebola outbreak is one of the largest Ebola outbreaks in history and the first in West Africa. It is affecting four countries in West Africa: Guinea, Liberia, Nigeria, and Sierra Leone, but does not pose a significant risk to the U.S. public. CDC is working with other U.S. government agencies, the World Health Organization, and other domestic and international partners in an international response to the current Ebola outbreak in West Africa. CDC has activated its Emergency Operations Center (EOC) to help coordinate technical assistance and control activities with partners. CDC has deployed several teams of public health experts to the West Africa region and plans to send additional public health experts to the affected countries to expand current response activities.

As of August 26, 2014

The Guinean Ministry of Health, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, and the Nigerian Ministry of Health are working with national and international partners to investigate and respond to the outbreak.

Guinea
  • The Guinea Ministry of Health announced 648 suspect and confirmed cases of Ebola virus disease (EVD), including 482 laboratory-confirmed cases, and 430 deaths.
  • Affected districts include Conakry, Guéckédou, Macenta, Kissidougou, Dabola, Djingaraye, Télimélé, Boffa, Kouroussa, Dubreka, Fria, Siguiri, Pita, Nzerekore, and Yamou; several are no longer active areas of EVD transmission (see map).
Liberia
  • The Ministry of Health and Social Welfare of Liberia and WHO have reported 1378 suspect and confirmed EVD cases, including 322 laboratory-confirmed, and 694 deaths.
Nigeria
  • The Nigerian Ministry of Health and WHO reported 17 suspect and confirmed cases, including 13 laboratory-confirmed, and 6 deaths.
Sierra Leone
  • The Ministry of Health and Sanitation of Sierra Leone and WHO reported a cumulative total of 1026 suspect and confirmed cases, including 935 laboratory-confirmed cases, and 422 deaths.
  • Cases have been confirmed in 11 of 12 Sierra Leone districts.
About the virus
  • Genetic analysis of the virus in this outbreak indicates that it is closely related (97% identical) to variants of Ebola virus (species Zaire ebolavirus) identified earlier in the Democratic Republic of the Congo and Gabon (Baize et al. 2014).

See the full outbreak update below »

Case Counts *

* Case counts updated in conjunction with the World Health Organization updates

Total Cases

Updated: August 28, 2014

  • Suspected and Confirmed Case Count: 3069
  • Suspected Case Deaths: 1552
  • Laboratory Confirmed Cases: 1752
Cases by Country
Guinea
  • Suspected and Confirmed Case Count: 648
  • Suspected Case Deaths: 430
  • Laboratory Confirmed Cases: 482
Liberia
  • Suspected and Confirmed Case Count: 1378
  • Suspected Case Deaths: 694
  • Laboratory Confirmed Cases: 322
Nigeria
  • Suspected and Confirmed Case Count: 17
  • Suspected and Confirmed Case Deaths: 6
  • Laboratory Confirmed Cases: 13
Sierra Leone
  • Suspected and Confirmed Case Count: 1026
  • Suspected and Confirmed Case Deaths: 422
  • Laboratory Confirmed Cases: 935

August 28, 2014

Outbreak Update - As of August 26, 2014

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria reported 3069 suspect and confirmed cases of EVD, including 1752 laboratory-confirmed cases, and 1552 deaths.

In Guinea, 648 cases of EVD, including 482 laboratory-confirmed cases, and 430 deaths were reported by the Ministry of Health of Guinea and WHO. Active surveillance continues in Conakry, Guéckédou, Dubreka, Pita, Siguiri, Kourourssa, Macenta, Yamou, and Nzerekore Districts.

The Ministry of Health and Social Welfare of Liberia and WHO reported 1378 clinical cases of EVD, including 322 laboratory-confirmed cases, and 694 deaths. Suspect and confirmed cases have been reported in 13 of 15 Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported 17 suspect cases, including 13 laboratory-confirmed cases, and 6 deaths.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported 1026 suspect and confirmed cases of EVD, including 935 laboratory-confirmed cases, 422 deaths. Reports, investigations, and testing of suspect cases continue across the country.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 28 August 2014

Previous Outbreak Updates (August 2014)

August 22, 2014

Outbreak Update - As of August 20, 2014

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria reported 2615 suspect and confirmed cases of EVD, including 1528 laboratory-confirmed cases, and 1427 deaths.

In Guinea, 607 cases of EVD, including 443 laboratory-confirmed cases, and 406 deaths were reported by the Ministry of Health of Guinea and WHO. Active surveillance continues in Conakry, Guéckédou, Dubreka, Pita, Siguiri, Kourourssa, Macenta, Yamou, and Nzerekore Districts.

The Ministry of Health and Social Welfare of Liberia and WHO reported 1082 clinical cases of EVD, including 269 laboratory-confirmed cases, and 624 deaths. Suspect and confirmed cases have been reported in 11 of 15 Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported 16 suspect cases, including 12 laboratory-confirmed cases, and 5 deaths.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported 910 suspect and confirmed cases of EVD, including 804 laboratory-confirmed cases, 392 deaths. All districts are now reporting clinical patients with EVD. Reports, investigations, and testing of suspect cases continue across the country.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 22 August 2014

August 21, 2014

Outbreak Update - As of August 18, 2014

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria reported 2473 suspect and confirmed cases of EVD, including 1460 laboratory-confirmed cases, and 1350 deaths.

In Guinea, 579 cases of EVD, including 423 laboratory confirmed cases, and 396 deaths were reported by the Ministry of Health of Guinea and WHO. Active surveillance continues in Conakry, Guéckédou, Dubreka, Pita, Siguiri, Kourourssa, Macenta, Yamou, and Nzerekore Districts.

The Ministry of Health and Social Welfare of Liberia and WHO reported 972 clinical cases of EVD, including 242 laboratory confirmations and 576 fatal cases. Suspect and confirmed cases have been reported in 9 of 13 Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported 15 suspect cases, including 12 laboratory confirmations, and 4 deaths.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported 907 suspect and confirmed cases of EVD, including 783 laboratory-confirmed cases, 374 deaths. All districts are now reporting clinical patients with EVD. Reports, investigations, and testing of suspect cases continue across the country.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 20 August 2014

August 19, 2014

Outbreak Update - As of August 16, 2014

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria reported 2240 suspect and confirmed cases of EVD, including 1383 laboratory-confirmed cases, and 1229 deaths.

In Guinea, 543 cases of EVD, including 396 laboratory confirmed cases, and 394 deaths were reported by the Ministry of Health of Guinea and WHO. Active surveillance continues in Conakry, Guéckédou, Dubreka, Pita, Siguiri, Kourourssa, Macenta, Yamou, and Nzerekore Districts.

The Ministry of Health and Social Welfare of Liberia and WHO reported 834 clinical cases of EVD, including 200 laboratory confirmations and 466 fatal cases. Suspect and confirmed cases have been reported in 9 of 13 Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported 15 suspect cases, including 12 laboratory confirmations, and 4 deaths.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported 848 suspect and confirmed cases of EVD, including 775 laboratory-confirmed cases, 365 deaths. All districts are now reporting clinical patients with EVD. Reports, investigations, and testing of suspect cases continue across the country.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 19 August 2014

August 15, 2014

Outbreak Update - As of August 13, 2014

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria reported 2127 suspect and confirmed cases of EVD, including 1310 laboratory-confirmed cases, and 1145 deaths.

In Guinea, 519 cases of EVD, including 376 laboratory confirmed-cases, and 380 deaths were reported by the Ministry of Health of Guinea and WHO. Active surveillance continues in Conakry, Guéckédou, Pita, Siguiri, Kourourssa, Macenta, Yamou, and Nzerekore Districts.

The Ministry of Health and Social Welfare of Liberia and WHO reported 786 clinical cases of EVD, including 190 laboratory confirmations and 413 fatal cases. Suspect and confirmed cases have been reported in 9 of 13 Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported 12 suspect cases, including 11 laboratory confirmations, and 4 deaths.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported 810 suspect and confirmed cases of EVD, including 733 laboratory-confirmed cases, 348 deaths. All districts are now reporting clinical patients with EVD. Reports, investigations, and testing of suspect cases continue across the country.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 15 August 2014

August 13, 2014

Outbreak Update

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria announced a cumulative total of 1975 suspect and confirmed cases of Ebola virus disease (EVD) and 1069 deaths, as of August 11, 2014. Of the 1975 clinical cases, 1251 cases have been laboratory confirmed for Ebola virus infection.

In Guinea, 510 cases, including 377 fatal cases and 369 laboratory confirmations of EVD, were reported by the Ministry of Health of Guinea and WHO as of August 11, 2014. Active surveillance continues in Conakry, Guéckédou, Pita, Siguiri, Kourourssa, Macenta, Yamou, and Nzerekore Districts.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported a cumulative total of 783 suspect and confirmed cases of EHF as of August 11, 2014. Of these 783, 706 cases have been laboratory confirmed and 334 were fatal. All districts are now reporting clinical EVD patients. Reports, investigations, and testing of suspect cases continue across the country.

As of August 11, 2014, the Ministry of Health and Social Welfare of Liberia and WHO reported 670 clinical cases of EVD, including 166 laboratory confirmations and 355 fatal cases. Suspect and confirmed cases have been reported in 9 of 13 Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported 12 suspect cases, including 10 laboratory confirmations and 3 fatal cases, as of August 11, 2014.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 13 August 2014.

August 12, 2014

Outbreak Update

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria announced a cumulative total of 1848 suspect and confirmed cases of Ebola virus disease (EVD) and 1013 deaths, as of August 9, 2014. Of the 1848 clinical cases, 1176 cases have been laboratory confirmed for Ebola virus infection.

In Guinea, 506 cases, including 373 fatal cases and 362 laboratory confirmations of EVD, were reported by the Ministry of Health of Guinea and WHO as of August 9, 2014. Active surveillance continues in Conakry, Guéckédou, Pita, Siguiri, Kourourssa, Macenta, Yamou, and Nzerekore Districts.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported a cumulative total of 730 suspect and confirmed cases of EHF as of August 9, 2014. Of these 730, 656 cases have been laboratory confirmed and 315 were fatal. All districts are now reporting clinical EVD patients. Reports, investigations, and testing of suspect cases continue across the country.

As of August 9, 2014, the Ministry of Health and Social Welfare of Liberia and WHO reported 599 clinical cases of EVD, including 158 laboratory confirmations and 323 fatal cases. Suspect and confirmed cases have been reported in 9 of 13 Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported 13 suspect cases, including 2 fatal cases, as of August 9, 2014.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 9 August 2014.

August 8, 2014

Outbreak Update

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria announced a cumulative total of 1779 suspect and confirmed cases of Ebola virus disease (EVD) and 961 deaths, as of August 6, 2014. Of the 1779 clinical cases, 1134 cases have been laboratory confirmed for Ebola virus infection.

In Guinea, 495 cases, including 367 fatal cases and 355 laboratory confirmations of EVD, were reported by the Ministry of Health of Guinea and WHO as of August 6, 2014. Active surveillance continues in Conakry, Guéckédou, Pita, Siguiri, Kourourssa, Macenta, and Nzerekore Districts.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported a cumulative total of 717 suspect and confirmed cases of EHF as of August 6, 2014. Of these 717, 631 cases have been laboratory confirmed and 298 were fatal. All districts are now reporting clinical EVD patients. Reports, investigations, and testing of suspect cases continue across the country.

As of August 6, 2014, the Ministry of Health and Social Welfare of Liberia and WHO reported 554 clinical cases of EVD, including 148 laboratory confirmations and 294 fatal cases. Suspect and confirmed cases have been reported in 9 of 13 Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported 13 suspect cases, including 2 fatal cases, as of August 6, 2014.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 8 August 2014.

August 6, 2014

Outbreak Update

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria announced a cumulative total of 1440 suspect and confirmed cases of Ebola virus disease (EVD) and 826 deaths, as of July 30, 2014. Of the 1440 clinical cases, 953 cases have been laboratory confirmed for Ebola virus infection.

In Guinea, 472 cases, including 346 fatal cases and 337 laboratory confirmations of EVD, were reported by the Ministry of Health of Guinea and WHO as of July 30, 2014. Active surveillance continues in Conakry, Guéckédou, Boffa, Pita, Siguiri, and Kourourssa Districts.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported a cumulative total of 574 suspect and confirmed cases of EHF as of July 30, 2014. Of these 574, 507 cases have been laboratory confirmed and 252 were fatal. Districts reporting clinical EVD patients include Kailahun, Kenema, Kambia, Port Loko, Bo and Western Area, which includes the capital, Freetown. More recently, Tonkolili, Bambali, Moyamba, and Bonthe Districts have also reported confirmed cases of EVD. Reports, investigations, and testing of suspect cases continue across the country.

As of July 30, 2014, the Ministry of Health and Social Welfare of Liberia and WHO reported 391 clinical cases of EVD, including 109laboratory confirmations and 227 fatal cases. Suspect and confirmed cases have been reported from Lofa, Montserado, Margibi, Bomi, Bong, Nimba, RiverCess, and Grand Cape Mount Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported one probable fatal case and 2 suspect cases as of July 30, 2014.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 30 July 2014.

August 4, 2014

Outbreak Update

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria announced a cumulative total of 1603 suspect and confirmed cases of Ebola virus disease (EVD) and 887 deaths, as of August 1, 2014. Of the 1603 clinical cases, 1009 cases have been laboratory confirmed for Ebola virus infection.

In Guinea, 485 cases, including 358 fatal cases and 340 laboratory confirmations of EVD, were reported by the Ministry of Health of Guinea and WHO as of August 1, 2014. Active surveillance continues in Conakry, Guéckédou, Boffa, Pita, Siguiri, and Kourourssa Districts.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported a cumulative total of 646 suspect and confirmed cases of EHF as of August 1, 2014. Of these 646, 540 cases have been laboratory confirmed and 273 were fatal. Districts reporting clinical EVD patients include Kailahun, Kenema, Kambia, Port Loko, Bo and Western Area, which includes the capital, Freetown. More recently, Tonkolili, Bambali, Moyamba, Bonthe, and Punjehun Districts have also reported confirmed cases of EVD. Reports, investigations, and testing of suspect cases continue across the country.

As of August 1, 2014, the Ministry of Health and Social Welfare of Liberia and WHO reported 468 clinical cases of EVD, including 129 laboratory confirmations and 255 fatal cases. Suspect and confirmed cases have been reported from Lofa, Montserado, Margibi, Bomi, Bong, Nimba, RiverCess, Grand Cape Mount, and Grand Bassa Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported 1 probable fatal case and 4 suspect cases as of August 1, 2014.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 4 August 2014.

August 3, 2014

Outbreak Update

The World Health Organization, in partnership with the Ministries of Health in Guinea, Sierra Leone, Liberia, and Nigeria announced a cumulative total of 1440 suspect and confirmed cases of Ebola virus disease (EVD) and 826 deaths, as of July 30, 2014. Of the 1440 clinical cases, 953 cases have been laboratory confirmed for Ebola virus infection.

In Guinea, 472 cases, including 346 fatal cases and 337 laboratory confirmations of EVD, were reported by the Ministry of Health of Guinea and WHO as of July 30, 2014. Active surveillance continues in Conakry, Guéckédou, Boffa, Pita, Siguiri, and Kourourssa Districts.

In Sierra Leone, WHO and the Ministry of Health and Sanitation of Sierra Leone reported a cumulative total of 574 suspect and confirmed cases of EHF as of July 30, 2014. Of these 574, 507 cases have been laboratory confirmed and 252 were fatal. Districts reporting clinical EVD patients include Kailahun, Kenema, Kambia, Port Loko, Bo and Western Area, which includes the capital, Freetown. More recently, Tonkolili, Bambali, Moyamba, and Bonthe Districts have also reported confirmed cases of EVD. Reports, investigations, and testing of suspect cases continue across the country.

As of July 30, 2014, the Ministry of Health and Social Welfare of Liberia and WHO reported 391 clinical cases of EVD, including 109laboratory confirmations and 227 fatal cases. Suspect and confirmed cases have been reported from Lofa, Montserado, Margibi, Bomi, Bong, Nimba, RiverCess, and Grand Cape Mount Counties. Laboratory testing is being conducted in Monrovia.

In Nigeria, WHO and the Nigerian Ministry of Health reported one probable fatal case and 2 suspect cases as of July 30, 2014.

CDC is in regular communication with all of the Ministries of Health (MOH), WHO, MSF, and other partners regarding the outbreak. Currently CDC has personnel in all four countries assisting the respective MOHs and the WHO-led international response to this Ebola outbreak.

Based on reports from the Ministry of Heath of Guinea, the Ministry of Health and Sanitation of Sierra Leone, the Ministry of Health and Social Welfare of Liberia, the Ministry of Health of Nigeria, and WHO 30 July 2014.

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