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(Joe Raedle/Getty Images)

President Obama, with CDC Director Dr. Tom Frieden, speaks to the media during a meeting with his Ebola Response Team, October 16, 2014 in Washington, DC. (Mark Wilson/Getty Images)

A man dressed in protective hazmat clothing leaves after treating the front porch and sidewalk of an apartment where a second person diagnosed with the Ebola virus resides on October 12, 2014 in Dallas, Texas. (Mike Stone/Getty Images)

New arrivals suspected of having Ebola await entry as a health worker disinfects an ambulance in a high risk area of the Doctors Without Borders (MSF), treatment center on October 5, 2014 in Paynesville, Liberia. (John Moore/Getty Images)

A Liberian Red Cross health worker disinfects a courtyard on September 10, 2014 in a district of Monrovia. (ZOOM DOSSO/AFP/Getty Images)

Nurses wearing protective suits escort a man infected with the Ebola virus to a hospital in Monrovia, August 25, 2014. (ZOOM DOSSO/AFP/Getty Images)