Data sources: David Ropeik/Harvard University, National Weather Service, World Health Organization, Northeastern University Laboratory for the Modeling of Biological and Socio-Technical Systems, National Geographic, United States Census Adam Cole and Ryan Kellman/NPR hide caption

itoggle caption Adam Cole and Ryan Kellman/NPR

At the onset of symptoms, Dr. Adaora Ingonoh (center) and her colleagues began drinking oral rehydration solution. It doesn't taste great but they say it helped them survive Ebola. They each downed over a gallon a day for nearly a week. Andrew Esiebo/Courtesy of WHO hide caption

itoggle caption Andrew Esiebo/Courtesy of WHO

Amber Vinson in a photograph taken earlier this week at Emory University Hospital in Atlanta. Officials at Emory and the Centers for Disease Control and Prevention couldn't detect Ebola in Amber Vinson as of Tuesday evening, her family said in a statement. AP hide caption

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Dr. Denis Mukwege (left) listens as Britain's Foreign Secretary William Hague speaks after the two men were presented Georgetown University's annual Hillary Rodham Clinton Award for Advancing Women in Peace and Security, at Georgetown University in Washington, in February. Mike Theiler/Reuters/Landov hide caption

itoggle caption Mike Theiler/Reuters/Landov

After losing most of his family to Ebola, health worker Alexander Kollie (right) is building a new life with son Kollie James, the 1,000th survivor of the disease to be cared for by Doctors Without Borders. Katy Athersuch/Courtesty of Doctors Without Borders hide caption

itoggle caption Katy Athersuch/Courtesty of Doctors Without Borders

Jeffrey Fowle, an American who had been detained in North Korea, spoke to The Associated Press last month in Pyongyang. Fowle was released by North Korean authorities and flown back to the U.S. on Tuesday. Wong Maye-E/AP hide caption

itoggle caption Wong Maye-E/AP

Ramzi El-Fekih, CEO of Creova, stands in his server room in Tunis. He has built a mobile payments company, but because of banking restrictions, Tunisians can use his product only for domestic purchases. Aarti Shahani/NPR hide caption

itoggle caption Aarti Shahani/NPR

Dutch Foreign Minister Bert Koenders (center) speaks with Luxembourg Foreign Minister Jean Asselborn (second from left) and British Foreign Minister Philip Hammond (right) during a round table meeting of EU foreign ministers in Luxembourg on Monday. The ministers hope to raise 1 billion euros to fight Ebola. Virginia Mayo/AP hide caption

itoggle caption Virginia Mayo/AP

The Rev. Herman Browne voluntarily quarantined himself for 21 days after his wife's friend tested positive for Ebola. On Sunday, he returned to his church, Trinity Cathedral, to preach to his congregation about Ebola prevention. Jon Hamilton/NPR hide caption

itoggle caption Jon Hamilton/NPR

Thomas Eric Duncan, the first Ebola patient diagnosed in the U.S., at a wedding in Ghana. Texas Health Presbyterian Hospital Dallas, where Duncan was being treated for the disease, on Wednesday, Oct. 8, 2014 said Duncan has died. Wilmot Chayee/AP hide caption

itoggle caption Wilmot Chayee/AP