WHO: Ebola Most Challenging Epidemic ‘in Decades’

Medical staff members of the Croix Rouge NGO carry on a stretcher the corpse of a victim of Ebola, after collecting it from a house in Monrovia, Sept. 29, 2014.

A man showing symptoms of Ebola waits to be admitted to at a treatment center in Monrovia, Liberia, Sept. 29, 2014.

A Nigerian port health official uses a thermometer to screen an unidentified Ukrainian crew member for Ebola, on the deck of a cargo ship at the Apapa port, in Lagos, Nigeria, Sept. 29, 2014.

A Nigerian port health official uses a thermometer to screen a Ukrainian captain, Bosenko Rusian,  for Ebola, on the deck of a cargo ship at the Apapa port, in Lagos, Nigeria, Sept. 29, 2014.

Liberian President Ellen Johnson Sirleaf arrives at the capitol to address lawmakers in Monrovia, Liberia, Sept. 29, 2014.

A teacher reacts after adding paint to a canvas following a performance by actors during an awareness campaign against Ebola at Anono school, in Abidjan, Ivory Coast, Sept. 25, 2014.

U.S. President Barack Obama shakes hands with Chairperson of the African Union Commission Dr. Nkosazana Dlamini Zuma after speaking at the United Nations meeting on the Ebola outbreak, in New York, Sept. 25, 2014.

Students wash their hands as a preventive measure against Ebola at Anono school in Abidjan, Ivory Coast, Sept. 25, 2014.

Actors parade on a street after performing at Anono school, during an awareness campaign against Ebola, in Abidjan, Ivory Coast, Sept. 25, 2014.

Actors, playing the role of Ebola (on left) and doctors (right), perform during an awareness campaign against the virus at Anono school in Abidjan, Ivory Coast, Sept. 25, 2014.

Health workers carry buckets of disinfectant at the newly-constructed Island Clinic and Ebola treatment center in Monrovia, Liberia, Sept. 25, 2014.