Colorized transmission electron micrograph (TEM) of the Ebola virus.
Medical personnel inside a clinic take care of Ebola patients in the outskirts of Kenema, Sierra Leone, on July 27, 2014
John Moore—Getty Images
A Liberian burial team wearing protective clothing retrieves the body of a 60-year-old Ebola victim from his home on Aug. 17, 2014 near Monrovia.
Daniel Berehulak—The New York Times/Redux
Residents look on as the body of a man suspected of dying from Ebola lies in a busy street, after it was reportedly dragged there to draw attention of burial teams following days of failed attempts by his family to have his body picked up, in Monrovia, Liberia, Sept. 15, 2014.
Pablo Martinez Monsivais—AP
President Barack Obama speaks at the Centers for Disease Control and Prevention (CDC) in Atlanta, Tuesday, Sept. 16, 2014. Obama traveled to the CDC, to address the Ebola crisis and announced that he is sending 3,000 American troops to West Africa nations fight the spread of the Ebola epidemic. (AP Photo/Pablo Martinez Monsivais)
FABRICE COFFRINI—AFP/Getty Images
World Health Organization's Assistant Director General Bruce Aylward holds a report on Ebola virus during a press conference on global aid pledged to fight the Ebola outbreak in west Africa
Health workers remove the body of Prince Nyentee, a 29-year-old man whom local residents said died of Ebola virus in Monrovia, Liberia on Sept. 11, 2014.
Dominique Faget—AFP/Getty Images
A street artist, Stephen Doe, paints an educational mural to inform people about the symptoms of the deadly Ebola virus in the Liberian capital, Monrovia, on Sept. 8, 2014
Health workers, attend to patients that contracted the Ebola virus, at a clinic in Monrovia, Liberia, Monday, Sept. 8, 2014.
Denis Balibouse / Reuters—REUTERS
Participants arrive at the opening of a consultation of international experts on potential Ebola therapies and vaccines in Geneva September 4, 2014.
Jessica McGowan—Getty Images
Dr. Kent Brantly an Ebola patient at Emory Hospital, stands with his wife, Amber Brantly, during a press conference announcing his release from the hospital on August 21, 2014 in Atlanta.
People celebrate in a street outside of West Point slum in Monrovia, Liberia, Aug. 30, 2014. Crowds cheer and celebrate in the streets after Liberian authorities reopened a slum where tens of thousands of people were barricaded amid the countryís Ebola outbreak.
Daniel Berehulak—The New York TImes/Redux
A burial team in protective clothing retrieves the body of an Ebola victim from an isolation ward in the West Point neighborhood of Monrovia, the capital of Liberia on Aug. 28, 2014.
A doctor, wearing protective gear, takes part in a drill with a dummy to demonstrate the procedures of handling a patient afflicted with the Ebola virus, in Hong Kong September 2, 2014.
A resident of the West Point neighborhood, which has been quarantined following an outbreak of Ebola, receives food rations from the U.N. World Food Programme in Monrovia, Liberia, on Aug. 28, 2014
MIKE LANE / Alamy
HEALTHY: for now Gorilla packs don't mingle much, which should protect them from Ebola infection