U.S. Ambassador to the United Nations Samantha Power has her temperature taken as she arrives in Freetown, Sierra Leone, on Monday. Power is on a visit to West Africa to get a first-hand look at the global response to the epidemic. Reuters/Landov hide caption

itoggle caption Reuters/Landov

This experimental Ebola vaccine, developed by the U.S. government, is just one of several undergoing small-scale, preliminary testing. University of Maryland School of Medicine/AP hide caption

itoggle caption University of Maryland School of Medicine/AP

Thomas Nellon (left), 17, and his brother Johnson Nellon, 14, of Liberia smile at their mother in the arrivals area at John F. Kennedy International Airport in New York earlier this month. The brothers received a health screening upon arrival. The U.S. says it will step up screening measures for arrivals from Ebola-affected West African countries. Craig Ruttle/AP hide caption

itoggle caption Craig Ruttle/AP

Senegalese fencer Abdoulaye Thiam (left) competed against Jason Rogers of the U.S. during the 2008 Olympics. Due to Ebola fears, a World Cup fencing event set for Senegal this month has been canceled. Philippe Desmazes/AFP/Getty Images hide caption

itoggle caption Philippe Desmazes/AFP/Getty Images

When a high-risk patient is evacuated, strict precautions are followed. Above, aid workers and doctors in protective gear transfer Manuel Garcia Viejo, a Spanish priest diagnosed with Ebola, to a waiting ambulance at a Madrid airport. Spanish Defense Ministry/AP hide caption

itoggle caption Spanish Defense Ministry/AP

Elliott Adekoya, 31, aka The Milkman, is a DJ at Monrovia's Sky FM radio, pictured here his DJ booth. He is also part of a group of 45 Liberian musicians called the Save Liberia Project. They want to get the word out that Ebola is real, but it is not a death sentence. He says that message, which was propagated early on by the Ministry of Health, actually contributed to the problem. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

Reported cases of Ebola in Liberia have dropped for three weeks in a row. The values include both probable and confirmed cases. Michaeleen Doucleff/World Health Organization hide caption

itoggle caption Michaeleen Doucleff/World Health Organization

There's no escaping Ebola in West Africa. Here, a seller of bananas walks past a slogan painted on a wall in Monrovia, the capital of Liberia. Domonique Faget/AFP/Getty Images hide caption

itoggle caption Domonique Faget/AFP/Getty Images

Port Louis is the capital of Mauritius, known as the "Switzerland of Africa" because of its wealth and its mountains. The country has banned visitors from Ebola-stricken nations. Paul Russell/Corbis hide caption

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Tonio Borg of Malta, the European Union's Health Commissioner, is spearheading the EU response to the Ebola outbreak. Gianluigi Guercia/AFP/Getty Images hide caption

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Some potential new Ebola drugs will be tested at treatment centers like this one run by Doctors Without Borders near Monrovia. John Moore/Getty Images hide caption

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Five ambulances, donated by the U.S. to help combat Ebola, are lined up after a ceremony attended by Sierra Leone's president, Ernest Bai Koroma, in Freetown on Sept. 10. Michael Duff/AP hide caption

itoggle caption Michael Duff/AP

Chlorine can stop the Ebola virus. So medical workers disinfect their hands often at the Doctors Without Borders treatment center in Kailahun, Sierra Leone. Carl De Souza/AFP/Getty Images hide caption

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