Global Health Pbs Newshour

We're sorry, the rights for this video have expired. | Listen to the AudioRELATED LINKSCDC director: ‘Ebola will get worse before it gets better’ American doctor speaks out about his Ebola recovery Doctors Without Borders: Ebola efforts need more people in the field GWEN IFILL: There were new numbers and a bleak projection today on the Ebola outbreak in West Africa.  At the same time, it appears human trials will begin for a possible vaccine as soon as next week. The ominous forecast came from the World Health Organization:  Ebola cases could top 20,000 as the outbreak continues to spread. DR. BRUCE AYLWARD, World Health Organization: It is now not just remote isolated areas where you can rapidly contain, but we are dealing with this disease in large urban environments and over large geographic areas.  This is very unique. GWEN IFILL: So far, the U.N. agency has confirmed more than 3,000 cases.  Of that number, more than half have died in Liberia, Sierra Leone, Guinea and Nigeria.  But the WHO says the outbre