The nursing staff get a break at the Ebola care center run by Doctors Without Borders in Foya, Liberia. The center has helped stop the spread of the virus. Michealeen Doucleff/NPR hide caption

itoggle caption Michealeen Doucleff/NPR

A female sanitation worker wears standard gear for a Doctors Without Borders Ebola center. The outfit includes rubber boots, goggles, a face mask, a hood, three layers of gloves, a Tyvek suit and thick rubber apron. No exposed skin is allowed. She was photographed in Monrovia, Liberia. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

New York Gov. Andrew Cuomo, left, listens Friday as New Jersey Gov. Chris Christie talks at a news conference in New York. The governors announced a mandatory quarantine for people returning to the United States through airports in New York and New Jersey who are deemed to be at "high risk" for Ebola. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP

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

Morris Nyumah wanted to help his country fight Ebola, so he signed up to work as a hygienist at the Doctors Without Borders care center in Lofa County. Tommy Trenchard for NPR hide caption

itoggle caption Tommy Trenchard for NPR

Dr. Joanne Liu (left), international president of Doctors Without Borders poses with a member of the MSF medical team at the organization's Ebola treatment center in Kailahun, Sierra Leone. P.K. Lee/Courtesy of Doctors Without Border hide caption

itoggle caption P.K. Lee/Courtesy of Doctors Without Border

Health workers at the Doctors Without Borders facility in Kailahun wear protective clothing when treating Ebola patients. Carl De Souza/AFP/Getty Images hide caption

itoggle caption Carl De Souza/AFP/Getty Images

Protective gear runs from goggles and head covering to gloves and boots. This health worker was photographed leaving the isolation area at the treatment center in Kailahun, Sierra Leone. Tommy Trenchard for NPR hide caption

itoggle caption Tommy Trenchard for NPR