Ebola survivor Lassana Jabeteh, 36, smiles before his shift as a nurse's assistant at the Doctors Without Borders (MSF), Ebola treatment center on October 12, 2014 in Paynesville, Liberia. He said that he previously worked as a taxi driver and that he thinks he caught Ebola when he transported a sick policeman who vomitied in his car on the way to the hospital. MSF hired Jabeteh after he recovered in their treatment center and he now counsels and comforts others stricken by the disease. Ebola leaves survivors immune to the strain that sickened them. (Photo by John Moore/Getty Images)