Ebola virus epidemic in West Africa

Ebola virus epidemic in West Africa
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Name	Ebola virus epidemic in West Africa
Date	December 2013 – June 2016
Location	Guinea; Liberia; Sierra Leone; Nigeria; Mali; Senegal; United Kingdom; United States
Deaths	~11,325
Confirmed cases	~28,616

Ebola virus epidemic in West Africa The Ebola virus epidemic in West Africa was a large-scale outbreak of Ebola virus disease that began in 2013 and peaked in 2014–2015, affecting multiple countries and prompting unprecedented international mobilization. The epidemic originated in rural Guinea and rapidly spread to neighboring Liberia and Sierra Leone, with exported cases reaching Nigeria, Mali, Senegal, Spain, United Kingdom, and the United States. The crisis strained regional health systems, drew involvement from agencies such as the World Health Organization and Centers for Disease Control and Prevention, and accelerated research by institutions including the National Institutes of Health and Public Health England.

Background and origins

The outbreak began in December 2013 in the village of Meliandou in southeastern Guinea, where initial zoonotic spillover likely involved fruit bats associated with the family Pteropodidae and human activities near the Niger River basin. Early patients visited healthcare facilities in Guéckédou and Macenta, linking chains of transmission to traditional burial practices in Forecariah and social networks spanning the Mano River region. Initial recognition was delayed despite alerts from national authorities in Conakry and regional public health actors, complicating early case detection by teams from the Ministry of Health (Guinea) and non-governmental organizations such as Médecins Sans Frontières.

Timeline and geographic spread

From the index event in Guinea the epidemic spread rapidly in 2014. By March 2014 clusters appeared in Lofa County and Monrovia in Liberia and in Kenema and Freetown in Sierra Leone, with case exportation via air travel to Lagos in Nigeria and to Bamako in Mali. Notable events include the October 2014 declaration of a public health emergency by the World Health Organization and local state-of-emergency measures in Liberia and Sierra Leone. Transmission dynamics were documented in studies by teams from Harvard University, London School of Hygiene & Tropical Medicine, and the Centers for Disease Control and Prevention (Nigeria), showing urban amplification in capital cities such as Freetown and Monrovia and recurrent flare-ups into 2015 in border districts like Kailahun.

Public health response and containment efforts

National responses included hospital isolation wards in Donka Hospital and Connaught Hospital, community engagement led by local councils in Kissidougou, and border screening at international airports such as Lungi International Airport. International mobilization involved deployments from Médecins Sans Frontières, the US Department of Defense, and the European Union Civil Protection Mechanism, while laboratory support came from the Bernhard Nocht Institute and the Pasteur Institute (Paris). Interventions combined case isolation, contact tracing by field teams from Sierra Leone Armed Forces and civil society groups, safe burial protocols adapted from World Health Organization guidelines, and community-based surveillance supported by UNICEF and International Federation of Red Cross and Red Crescent Societies.

Impact and consequences

Human tolls included thousands of fatalities among patients treated in facilities such as ELWA Hospital and significant morbidity among survivors monitored by clinics in Conakry and Freetown. The epidemic disrupted services at institutions like John F. Kennedy Medical Center and affected education systems with school closures ordered by ministries in Monrovia and Freetown. Economic shocks hit sectors including mining firms operating near Nimba County and agricultural trade across the Trans–West African Coastal Highway, with socioeconomic studies by World Bank and International Monetary Fund estimating large output losses. Political responses involved national leaders including Alpha Condé and international diplomacy via the United Nations Security Council and the African Union.

International aid and coordination

Coordination relied on mechanisms such as the WHO Health Emergencies Programme and the United Nations Mission for Ebola Emergency Response (UNMEER), while bilateral assistance came from the United States Agency for International Development, United Kingdom Department for International Development, and the Government of China. Military and logistical support was provided by the US Africa Command and the French Armed Forces in coordination with ministries and agencies like CDC and Public Health England. Philanthropic contributions were significant from entities such as the Bill & Melinda Gates Foundation and Wellcome Trust, and global health partnerships engaged the Coalition for Epidemic Preparedness Innovations and the Global Outbreak Alert and Response Network.

Scientific research and vaccine development

The epidemic accelerated research at institutions including the National Institutes of Health, University of Oxford, and Institut Pasteur, advancing candidate vaccines such as the rVSV-ZEBOV regimen developed through collaborations with Merck & Co., NewLink Genetics, and the Wellcome Trust. Clinical trial designs used ring-vaccination methods informed by previous work at Centers for Disease Control and Prevention and field trials in Guinea. Therapeutic research included monoclonal antibody efforts from ZMapp developers and antiviral evaluations by teams at European Medicines Agency-linked laboratories. Genomic surveillance by groups at Sierra Leone-China Friendship Hospital and Broad Institute traced viral lineages and international introductions, informing policy by the World Health Organization and shaping the post-epidemic strengthening of regional capacities such as the Africa Centres for Disease Control and Prevention.

Category:Epidemics