A scientist tests a patient's blood for Ebola at the European Mobile Laboratory in Gueckedou, Guinea. The first cases reported in the outbreak occurred in a small village about eight miles outside Gueckedou. Misha Hussain /Reuters /Landov hide caption

itoggle caption Misha Hussain /Reuters /Landov

Jude Law prepares for the looming pandemic in the 2011 movie Contagion. There are huge differences between viruses in movies and Ebola in real life. Warner Bros/The Kobal Collection hide caption

itoggle caption Warner Bros/The Kobal Collection

Dr. Kent Brantly (center) announces his recovery from Ebola, with his wife, Amber Brantly (left), during a press conference at Emory University Hospital Thursday in Atlanta. Brantly got sick at the end of July. Jessica McGowan/Getty Images hide caption

itoggle caption Jessica McGowan/Getty Images

Dr. Bruce Ribner, medical director of Emory University Hospital's infectious disease unit, embraces Dr. Kent Brantly (left) who was treated with an experimental Ebola medicine and released from the Atlanta hospital Thursday. John Bazemore/AP hide caption

itoggle caption John Bazemore/AP

Workers with the aid group Doctors Without Borders prepare a new Ebola treatment center near Monrovia, Liberia, on Sunday. The facility has 120 beds, making it the largest Ebola isolation clinic in history. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

An outbreak of bird flu in India in 2008 prompted authorities to temporarily ban the sale of poultry. Diptendu Dutta/AFP/Getty Images hide caption

itoggle caption Diptendu Dutta/AFP/Getty Images

Employees of a petroleum company in Liberia help to curb Ebola's spread via a public health awareness campaign Monday. West Africa is facing its first Ebola outbreak, so questions abound. Abbas Dulleh/AP hide caption

itoggle caption Abbas Dulleh/AP

The usual suspect: Bats harbor dozens of deadly viruses, such as rabies and influenza. Several studies suggest that bats may also carry Ebola. Tyler Hicks/Getty Images hide caption

itoggle caption Tyler Hicks/Getty Images

Television trucks converged on Mount Sinai Hospital in New York on Monday after it announced that it was screening a patient for Ebola virus. Stan Honda/AFP/Getty Images hide caption

itoggle caption Stan Honda/AFP/Getty Images

When Sule Koroma's sister Saudatu died of Ebola, his house in Freetown was put under a 21-day quarantine. The government sent two policeman to guard the house. Tommy Trenchard for NPR hide caption

itoggle caption Tommy Trenchard for NPR

Dr. Kent Brantly, of Fort Worth, Texas, was treating Ebola patients in Monrovia, Liberia, when he himself became infected with the virus. Courtesy of Samaritan's Purse hide caption

itoggle caption Courtesy of Samaritan's Purse

Red Cross volunteers prepare to bury the body of an Ebola victim in Pendembu, Sierra Leone, early this month. Tommy Trenchard for NPR hide caption

itoggle caption Tommy Trenchard for NPR