West African Ebola Epidemic
The West African Ebola epidemic, which ran from 2014 to 2016, was the largest outbreak of Ebola virus disease ever recorded. It spread mainly through Guinea, Liberia and Sierra Leone, caused more than 11,000 deaths among roughly 28,000 reported cases, and exposed serious weaknesses in how the world prepares for and responds to infectious disease emergencies.
Ebola virus was first identified in 1976 near the Ebola River in what is now the Democratic Republic of the Congo, and earlier outbreaks in Central Africa had generally been small and short-lived, often in remote areas. The virus spreads through direct contact with the blood or other bodily fluids of an infected person, or of someone who has died from the disease. Fruit bats are widely believed to be a natural reservoir. West Africa had never experienced an outbreak before, so health workers and communities were unfamiliar with the disease. Guinea, Liberia and Sierra Leone were also recovering from years of conflict or instability, and their health systems had few doctors, limited laboratory capacity and little protective equipment.
Investigators later traced the epidemic to a young child who died in a village in southeastern Guinea in late 2013. The disease circulated for months before it was identified as Ebola in March 2014. By then it had crossed borders and reached towns and cities, where dense populations and frequent travel helped it spread. Traditional funeral practices, which involve touching the body, caused many infections. Fear and mistrust also led some people to avoid treatment centers or resist public health advice. In August 2014 the World Health Organization declared a public health emergency of international concern. Cases surged through the autumn, overwhelming hospitals and treatment units, and health workers died in large numbers.
Gradually, the response gathered strength. Governments, local communities, the WHO, Médecins Sans Frontières and foreign militaries and aid agencies built treatment centers, expanded contact tracing, introduced safe burial teams and promoted behavior changes. Cases in the three countries began to fall in late 2014 and 2015. A few isolated cases were imported to Nigeria, Mali, Senegal, the United States, Spain and the United Kingdom, though they led to limited further spread. The WHO ended the emergency declaration in March 2016, although small flare-ups continued afterward.
The epidemic left deep scars. Many thousands of children lost parents, survivors faced lasting health problems and stigma, and routine care for illnesses such as malaria and childbirth suffered when clinics closed or people stayed away. Economies were badly hit. Critics said the international response had come too late, which prompted reforms to WHO emergency operations and new funding mechanisms. The crisis also accelerated work on vaccines and treatments, and an Ebola vaccine proved valuable in later outbreaks in the Democratic Republic of the Congo.