Virus

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<span style="font-family: Verdana, sans-serif;">Key facts</span></h3>
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<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Ebola virus disease (EVD), formerly known as Ebola haemorrhagic fever, is a severe, often fatal illness in humans.</span></li>
<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">The virus is transmitted to people from wild animals and spreads in the human population through human-to-human transmission.</span></li>
<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">The average EVD case fatality rate is around 50%. Case fatality rates have varied from 25% to 90% in past outbreaks.</span></li>
<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">The first EVD outbreaks occurred in remote villages in Central Africa, near tropical rainforests, but the most recent outbreak in west Africa has involved major urban as well as rural areas.</span></li>
<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Community engagement is key to successfully controlling outbreaks. Good outbreak control relies on applying a package of interventions, namely case management, surveillance and contact tracing, a good laboratory service, safe burials and social mobilisation.</span></li>
<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Early supportive care with rehydration, symptomatic treatment improves survival. There is as yet no licensed treatment proven to neutralise the virus but a range of blood, immunological and drug therapies are under development.</span></li>
<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">There are currently no licensed Ebola vaccines but 2 potential candidates are undergoing evaluation.</span></li>
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<span style="font-family: Verdana, sans-serif;">Background</span></h3>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">The Ebola virus causes an acute, serious illness which is often fatal if untreated. Ebola virus disease (EVD) first appeared in 1976 in 2 simultaneous outbreaks, one in Nzara, Sudan, and the other in Yambuku, Democratic Republic of Congo. The latter occurred in a village near the Ebola River, from which the disease takes its name.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">The current outbreak in west Africa, (first cases notified in March 2014), is the largest and most complex Ebola outbreak since the Ebola virus was first discovered in 1976. There have been more cases and deaths in this outbreak than all others combined. It has also spread between countries starting in Guinea then spreading across land borders to Sierra Leone and Liberia, by air (1 traveller only) to Nigeria, and by land (1 traveller) to Senegal.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">The most severely affected countries, Guinea, Sierra Leone and Liberia have very weak health systems, lacking human and infrastructural resources, having only recently emerged from long periods of conflict and instability. On August 8, the WHO Director-General declared this outbreak a Public Health Emergency of International Concern.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">A separate, unrelated Ebola outbreak began in Boende, Equateur, an isolated part of the Democratic Republic of Congo.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">The virus family Filoviridae includes 3 genera: Cuevavirus, Marburgvirus, and Ebolavirus. There are 5 species that have been identified: Zaire, Bundibugyo, Sudan, Reston and Taï Forest. The first 3, Bundibugyo ebolavirus, Zaire ebolavirus, and Sudan ebolavirus have been associated with large outbreaks in Africa. The virus causing the 2014 west African outbreak belongs to the Zaire species.</span></span></div>
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<span style="font-family: Verdana, sans-serif;">Transmission</span></h3>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">It is thought that fruit bats of the Pteropodidae family are natural Ebola virus hosts. Ebola is introduced into the human population through close contact with the blood, secretions, organs or other bodily fluids of infected animals such as chimpanzees, gorillas, fruit bats, monkeys, forest antelope and porcupines found ill or dead or in the rainforest.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Ebola then spreads through human-to-human transmission via direct contact (through broken skin or mucous membranes) with the blood, secretions, organs or other bodily fluids of infected people, and with surfaces and materials (e.g. bedding, clothing) contaminated with these fluids.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Health-care workers have frequently been infected while treating patients with suspected or confirmed EVD. This has occurred through close contact with patients when infection control precautions are not strictly practiced.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Burial ceremonies in which mourners have direct contact with the body of the deceased person can also play a role in the transmission of Ebola.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">People remain infectious as long as their blood and body fluids, including semen and breast milk, contain the virus. Men who have recovered from the disease can still transmit the virus through their semen for up to 7 weeks after recovery from illness.</span></span></div>
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<span style="font-family: Verdana, sans-serif;">Symptoms of Ebola virus disease</span></h3>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">The incubation period, that is, the time interval from infection with the virus to onset of symptoms is 2 to 21 days. Humans are not infectious until they develop symptoms. First symptoms are the sudden onset of fever fatigue, muscle pain, headache and sore throat. This is followed by vomiting, diarrhoea, rash, symptoms of impaired kidney and liver function, and in some cases, both internal and external bleeding (e.g. oozing from the gums, blood in the stools). Laboratory findings include low white blood cell and platelet counts and elevated liver enzymes.</span></span></div>
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<span style="font-family: Verdana, sans-serif;">Diagnosis</span></h3>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">It can be difficult to distinguish EVD from other infectious diseases such as malaria, typhoid fever and meningitis. Confirmation that symptoms are caused by Ebola virus infection are made using the following investigations:</span></span></div>
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<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">electron microscopy</span></li>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Samples from patients are an extreme biohazard risk; laboratory testing on non-inactivated samples should be conducted under maximum biological containment conditions.</span></span></div>
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<span style="font-family: Verdana, sans-serif;">Treatment and vaccines</span></h3>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Supportive care-rehydration with oral or intravenous fluids- and treatment of specific symptoms, improves survival. There is as yet no proven treatment available for EVD. However, a range of potential treatments including blood products, immune therapies and drug therapies are currently being evaluated. No licensed vaccines are available yet, but 2 potential vaccines are undergoing human safety testing.</span></span></div>
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<span style="font-family: Verdana, sans-serif;">Prevention and control</span></h3>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Good outbreak control relies on applying a package of interventions, namely case management, surveillance and contact tracing, a good laboratory service, safe burials and social mobilisation. Community engagement is key to successfully controlling outbreaks. Raising awareness of risk factors for Ebola infection and protective measures that individuals can take is an effective way to reduce human transmission. Risk reduction messaging should focus on several factors:</span></span></div>
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<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;"><b>Reducing the risk of wildlife-to-human transmission</b> from contact with infected fruit bats or monkeys/apes and the consumption of their raw meat. Animals should be handled with gloves and other appropriate protective clothing. Animal products (blood and meat) should be thoroughly cooked before consumption.</span></li>
<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;"><b>Reducing the risk of human-to-human transmission</b> from direct or close contact with people with Ebola symptoms, particularly with their bodily fluids. Gloves and appropriate personal protective equipment should be worn when taking care of ill patients at home. Regular hand washing is required after visiting patients in hospital, as well as after taking care of patients at home.</span></li>
<li style="background-image: url(http://www.who.int/sysmedia/media/style/img/list.gif); background-position: 0% 0.5em; background-repeat: no-repeat; border: 0px; font-style: inherit; font-weight: inherit; line-height: 15px; margin: 0px; outline: 0px; padding: 2px 0px 1px 18px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;"><b>Outbreak containment measures</b> including prompt and safe burial of the dead, identifying people who may have been in contact with someone infected with Ebola, monitoring the health of contacts for 21 days, the importance of separating the healthy from the sick to prevent further spread, the importance of good hygiene and maintaining a clean environment.</span></li>
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<span style="font-family: Verdana, sans-serif;">Controlling infection in health-care settings:</span></h3>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Health-care workers should always take standard precautions when caring for patients, regardless of their presumed diagnosis. These include basic hand hygiene, respiratory hygiene, use of personal protective equipment (to block splashes or other contact with infected materials), safe injection practices and safe burial practices.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Health-care workers caring for patients with suspected or confirmed Ebola virus should apply extra infection control measures to prevent contact with the patient’s blood and body fluids and contaminated surfaces or materials such as clothing and bedding. When in close contact (within 1 metre) of patients with EBV, health-care workers should wear face protection (a face shield or a medical mask and goggles), a clean, non-sterile long-sleeved gown, and gloves (sterile gloves for some procedures).</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">Laboratory workers are also at risk. Samples taken from humans and animals for investigation of Ebola infection should be handled by trained staff and processed in suitably equipped laboratories.</span></span></div>
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<span style="font-family: Verdana, sans-serif;">WHO response</span></h3>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">WHO aims to prevent Ebola outbreaks by maintaining surveillance for Ebola virus disease and supporting at-risk countries to developed preparedness plans. The document provides overall guidance for control of Ebola and Marburg virus outbreaks:</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">When an outbreak is detected WHO responds by supporting surveillance, community engagement, case management, laboratory services, contact tracing, infection control, logistical support and training and assistance with safe burial practices.</span></span></div>
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<span style="border: 0px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><span style="font-family: Verdana, sans-serif;">WHO has developed detailed advice on Ebola infection prevention and control:</span></span></div>
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