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.
A volunteer receives the experimental Ebola vaccination "cAd3-EBO-Z" at the vaccines center in Bamako, Mali, earlier this month. Mali has become the sixth country in West Africa to report Ebola.
Alex Duval Smith/EPA/Landov
A market area sat empty last month in Freetown, Sierra Leone, as the country's government enforced a three-day lockdown in an attempt to halt the spread of the Ebola virus.
Health workers are handed personal protective gear before collecting the bodies of the deceased from streets in Monrovia, Liberia, on Saturday. Liberia is one of three West African countries hard-hit by the Ebola outbreak.
Eerie protective suits and shiny body bags have fueled rumors about the origins of Ebola. Here, a burial team removes the body of a person suspected to have died from the virus in the village of Pendembu, Sierra Leone.
Tommy Trenchard for NPR
Rose Komano, 18 and the mother of three, was the first Ebola patient to overcome the virus in southeastern Guinea, the epicenter of the outbreak. On April 3, she posed at a health clinic in the Gueckedou region.
Misha Hussain /Reuters /Landov
A nurse of the 'Doctors without Borders' medical aid organisation examines a patient in the in-take area at a center for victims of the Ebola virus in Guekedou, on April 1, 2014. The viral haemorrhagic fever epidemic raging in Guinea is caused by several viruses which have similar symptoms â the deadliest and most feared of which is Ebola.