Liberian security forces patrol the waters around the Ebola quarantine area of West Point to stop residents crossing to the city centre of Monrovia August 24, 2014. In an attempt to contain the virus, Liberia imposed a quarantine in West Point, a large slum in the capital Monrovia, on August 19. Security forces have been deployed to stop people from entering or leaving the area. REUTERS/2Tango (LIBERIA - Tags: HEALTH DISASTER SOCIETY) 

Liberian security forces patrol the waters around the Ebola quarantine area of West Point to stop residents crossing to the city centre of Monrovia August 24, 2014. In an attempt to contain the virus, Liberia imposed a quarantine in West Point, a large slum in the capital Monrovia, on August 19. Security forces have been deployed to stop people from entering or leaving the area. REUTERS/2Tango (LIBERIA - Tags: HEALTH DISASTER SOCIETY) 

Medicins Sans Frontieres (MSF) health workers prepare at ELWA's hospital isolation camp during the visit of Senior United Nations (U.N.) System Coordinator for Ebola, David Nabarro, in Monrovia August 23, 2014. As the outbreak has spread across borders from its initial epicentre in Guinea, governments in the region have introduced increasingly strict travel restrictions. Ivory Coast has closed its land borders Guinea and Liberia to try to prevent the virus from crossing onto its territory, the government announced late on Friday. REUTERS/2Tango (LIBERIA - Tags: HEALTH SOCIETY DISASTER) 

Medicins Sans Frontieres (MSF) health workers disinfect protection clothes outside the isolation unit at ELWA hospital during the visit of Senior United Nations (U.N.) System Coordinator for Ebola David Nabarro, not pictured, in Monrovia August 23, 2014. As the outbreak has spread across borders from its initial epicentre in Guinea, governments in the region have introduced increasingly strict travel restrictions. Ivory Coast has closed its land borders Guinea and Liberia to try to prevent the virus from crossing onto its territory, the government announced late on Friday. REUTERS/2Tango (LIBERIA - Tags: HEALTH DISASTER SOCIETY) 

A Medicins Sans Frontieres (MSF) health worker stands outside the isolation unit during the visit of Senior United Nations (U.N.) System Coordinator for Ebola David Nabarro (not pictured) at ELWA hospital, in Monrovia August 23, 2014. As the outbreak has spread across borders from its initial epicentre in Guinea, governments in the region have introduced increasingly strict travel restrictions. Ivory Coast has closed its land borders Guinea and Liberia to try to prevent the virus from crossing onto its territory, the government announced late on Friday. REUTERS/2Tango (LIBERIA - Tags: HEALTH SOCIETY DISASTER) 

Medicins Sans Frontieres (MSF) health workers disinfect protection clothes and boots outside the isolation unit at ELWA hospital during the visit of Senior United Nations (U.N.) System Coordinator for Ebola David Nabarro (not pictured), in Monrovia August 23, 2014. As the outbreak has spread across borders from its initial epicentre in Guinea, governments in the region have introduced increasingly strict travel restrictions. Ivory Coast has closed its land borders Guinea and Liberia to try to prevent the virus from crossing onto its territory, the government announced late on Friday. REUTERS/2Tango (LIBERIA - Tags: HEALTH DISASTER SOCIETY) 

Protection clothes and boots from Medicins Sans Frontieres (MSF) health workers are seen drying outside the isolation unit at ELWA hospital during the visit of Senior United Nations (U.N.) System Coordinator for Ebola David Nabarro (not pictured), in Monrovia August 23, 2014. As the outbreak has spread across borders from its initial epicentre in Guinea, governments in the region have introduced increasingly strict travel restrictions. Ivory Coast has closed its land borders Guinea and Liberia to try to prevent the virus from crossing onto its territory, the government announced late on Friday. REUTERS/2Tango (LIBERIA - Tags: HEALTH DISASTER SOCIETY) 

Medicins Sans Frontieres (MSF) health workers prepare at ELWA's isolation camp during the visit of Senior United Nations (U.N.) System Coordinator for Ebola David Nabarro, at the camp in Monrovia August 23, 2014.As the outbreak has spread across borders from its initial epicentre in Guinea, governments in the region have introduced increasingly strict travel restrictions. Ivory Coast has closed its land borders Guinea and Liberia to try to prevent the virus from crossing onto its territory, the government announced late on Friday. REUTERS/2Tango (LIBERIA - Tags: HEALTH SOCIETY DISASTER TPX IMAGES OF THE DAY) 

Residents, who are in an Ebola quarantine area, complain to a security officer as they wait for their relatives to bring them food and essentials, in West Point, Monrovia August 23, 2014. In an attempt to contain the virus, Liberia imposed a quarantine in West Point, a large slum in the capital Monrovia, on August 19. Security forces have been deployed to stop people from entering or leaving the area. REUTERS/2Tango (LIBERIA - Tags: HEALTH DISASTER SOCIETY) 

Relatives stand in line at a checkpoint, outside the Ebola quarantine area of West Point, as they carry food and essentials for their family members, in Monrovia August 23, 2014. In an attempt to contain the virus, Liberia imposed a quarantine in West Point, a large slum in the capital Monrovia, on August 19. Security forces have been deployed to stop people from entering or leaving the area. REUTERS/2Tango (LIBERIA - Tags: HEALTH SOCIETY DISASTER) 

Senior United Nations (U.N.) System Coordinator for Ebola, David Nabarro (L), talks with a Medicins Sans Frontieres (MSF) health worker during his visit, outside the ELWA's hospital isolation unit in Monrovia August 23, 2014. As the outbreak has spread across borders from its initial epicentre in Guinea, governments in the region have introduced increasingly strict travel restrictions. Ivory Coast has closed its land borders Guinea and Liberia to try to prevent the virus from crossing onto its territory, the government announced late on Friday. REUTERS/2Tango (LIBERIA - Tags: HEALTH SOCIETY DISASTER) 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH

Health workers wearing protective clothing prepare to carry an abandoned dead body presenting with Ebola symptoms at Duwala market in Monrovia August 17, 2014. To try to control the Ebola epidemic spreading through West Africa, Liberia has quarantined remote villages at the epicentre of the virus, evoking the "plague villages" of medieval Europe that were shut off from the outside world. REUTERS/2Tango 

Health workers wearing protective clothing prepare themselves before to carrying an abandoned dead body presenting with Ebola symptoms at Duwala market in Monrovia August 17, 2014. To try to control the Ebola epidemic spreading through West Africa, Liberia has quarantined remote villages at the epicentre of the virus, evoking the "plague villages" of medieval Europe that were shut off from the outside world. REUTERS/2Tango 

Health workers wearing protective clothing prepare to carry an abandoned dead body presenting with Ebola symptoms at Duwala market in Monrovia August 17, 2014. To try to control the Ebola epidemic spreading through West Africa, Liberia has quarantined remote villages at the epicentre of the virus, evoking the "plague villages" of medieval Europe that were shut off from the outside world. REUTERS/2Tango 

Health workers wearing protective clothing prepare to carry an abandoned dead body presenting with Ebola symptoms at Duwala market in Monrovia August 17, 2014. To try to control the Ebola epidemic spreading through West Africa, Liberia has quarantined remote villages at the epicentre of the virus, evoking the "plague villages" of medieval Europe that were shut off from the outside world. REUTERS/2Tango 

Health workers wearing protective clothing prepare to carry an abandoned dead body presenting with Ebola symptoms at Duwala market in Monrovia August 17, 2014. To try to control the Ebola epidemic spreading through West Africa, Liberia has quarantined remote villages at the epicentre of the virus, evoking the "plague villages" of medieval Europe that were shut off from the outside world. REUTERS/2Tango 

Health workers wearing protective clothing disinfect themselves after an abandoned dead body presenting with Ebola symptoms was found at Duwala market in Monrovia August 17, 2014. To try to control the Ebola epidemic spreading through West Africa, Liberia has quarantined remote villages at the epicentre of the virus, evoking the "plague villages" of medieval Europe that were shut off from the outside world. REUTERS/2Tango 

A Liberian woman stands as health workers wearing protective clothing prepare to carry an abandoned dead body presenting with Ebola symptoms at Duwala market in Monrovia August 17, 2014. To try to control the Ebola epidemic spreading through West Africa, Liberia has quarantined remote villages at the epicentre of the virus, evoking the "plague villages" of medieval Europe that were shut off from the outside world. REUTERS/2Tango 

A boy stands near posters displaying a government message against Ebola at Duwala market in Monrovia August 17, 2014. To try to control the Ebola epidemic spreading through West Africa, Liberia has quarantined remote villages at the epicentre of the virus, evoking the "plague villages" of medieval Europe that were shut off from the outside world. REUTERS/2Tango