Current Situation

Cases in the most affected countries

  • The week to 17 May saw the highest weekly total of confirmed cases of Ebola virus disease (EVD) for over a month, with 35 cases reported from Guinea and Sierra Leone. This is a substantial increase compared with 9 cases reported the previous week. The geographical area of transmission has also expanded compared with recent weeks, with a total of 6 districts reporting cases (3 in Guinea, 3 in Sierra Leone), compared with 3 the previous week (2 in Guinea, 1 in Sierra Leone). Capacity for improved community engagement, case investigation, and targeted, active surveillance continues to be strengthened in areas of continuing transmission to ensure that remaining chains of transmission are detected, contained, and brought to an end.
  • Guinea reported a total of 27 cases, compared with 7 cases the previous week. The majority of cases were reported from the western prefectures of Dubreka (11 cases) and Forecariah (11 cases), with the remaining 5 cases reported from the north western prefecture of Boke, which borders Guinea-Bissau. The cases in Boke were tightly clustered in the coastal sub-prefecture of Kamsar, and initial investigations suggest they may have originated from a chain of transmission in Conakry. All 11 cases reported from Dubreka came from the sub-prefecture of Tanene. Although the exact origin of the cluster is unknown, retrospective investigation has linked most of the confirmed cases to 4 probable cases who attended a funeral of another probable case in Dubreka in mid-April, which may have been the source of the outbreak. Difficulty engaging local communities has made case investigation and contact tracing in the area challenging. In Forecariah, 11 cases were distributed across 6 of the prefecture’s 10 sub-prefectures. A total of 9 of the 27 cases reported from Guinea originated from an unknown source, indicating that chains of transmission continue to evade detection in several areas.

Our Work

WHO works with national governments and leads the international community to provide emergency health services in countries with widespread Ebola transmission as well as prevent outbreaks in countries that are unaffected.


Stop transmission in all affected countries by:

  • Identify and trace people with Ebola
  • Care for persons with Ebola
  • Safe and dignified burials
  • Infection prevention and control

Prevent outbreaks in any new countries:

  • Cross border preparedness and communication
  • Preparedness in unaffected countries
  • Rapid response teams for new outbreaks
Research and Development

Fast track access to new health technologies:

  • New vaccines
  • Rapid diagnostics
  • Treatments
  • Blood products

Get Involved


Funding requirements for WHO Ebola response plan, March - December 2015

If you want to play a more direct role in the response then consider WHO vacancies and also visit UN Volunteering in the West Africa region.


09 May 2015

Today, 9 May 2015, marks 42 days since the last confirmed case of Ebola in Liberia was safely buried — the period of time set by WHO to declare an outbreak over.

07 May 2015

The outbreak of Ebola Virus Disease (EVD) will be considered ended in any one of the above countries after 42 days have passed since the last confirmed case has tested negative twice for the virus...

04 May 2015

Dr Komba Songu-Mbriwa is a doctor on the frontlines of the Ebola fight in Sierra Leone who also knows the challenges of the disease firsthand. He is an Ebola survivor.

01 May 2015

Following the start of the Ebola outbreak in 2014, the intensely-affected countries suspended all large-scale national mass immunization campaigns for diseases like measles and polio.

24 April 2015

Mikiko Senga, a WHO epidemiologist specializing in emerging diseases was sent to Kenema, Sierra Leone in early June 2014 to gather data about the Ebola outbreak.

WHO timeline tweets

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