Makutu Jabateh hugs her daughter, Mabana Konneh, 5, as the little girl returns home to her neighborhood in Jacobstown, Monrovia. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

Viruses can spread through the air in two ways: inside large droplets that fall quickly to the ground (red), or inside tiny droplets that float in the air (gray). In the first route, called droplet transmission, the virus can spread only about 3 to 6 feet from an infected person. In the second route, called airborne transmission, the virus can travel 30 feet or more. Adam Cole/NPR hide caption

itoggle caption Adam Cole/NPR

Dr. Komba Songu M'Briwah, left, talks on the phone while staff members disinfect offices at the Hastings Ebola Treatment Center in Freetown. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

India has record no Ebola cases, but the country is on high alert and has quarantined hundreds of travelers from West Africa. This hospital in New Delhi has set up an Intensive Care Unit for potential Ebola patients. Sajjad Hussain/AFP/Getty Images hide caption

itoggle caption Sajjad Hussain/AFP/Getty Images

Women who underwent sterilization surgery at a government-run camp were hospitalized in the Indian state of Chhattisgarh after 13 patients died following the procedure. Anindito Mukherjee/Reuters/Landov hide caption

itoggle caption Anindito Mukherjee/Reuters/Landov

Facebook CEO Mark Zuckerberg has launched an Ebola donation campaign on the website and tossed in $25 million of his money to help fight the virus. Ben Margot/AP hide caption

itoggle caption Ben Margot/AP

Private Ernest Cable was buried in a cemetery in Wimereux, France. He died from dysentery in a hotel turned hospital in the northern French town. Courtesy of Genome Research Ltd hide caption

itoggle caption Courtesy of Genome Research Ltd

David Quammen's new book is an extended excerpt of his previous one, Spillover, which explored how dangerous pathogens jump from animals to people. Courtesy of David Quammen hide caption

itoggle caption Courtesy of David Quammen

Mariama and Fomba Kanneh play in an open space in Barkedu, Liberia. With schools closed across the country, many kids spend their time playing outside every day. Tommy Trenchard for NPR hide caption

itoggle caption Tommy Trenchard for NPR

A Kenyan senior citizen leans on his cane. As people age in parts of Africa, they report declining levels of satisfaction with their life. Roberto Schmidt/AFP/Getty Images hide caption

itoggle caption Roberto Schmidt/AFP/Getty Images

Children play in the West Point neighborhood of Monrovia last week. West Point has been hit hard by Ebola. So local leaders formed their own Ebola task force, which goes door to door looking for cases. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

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