Doctors Aren't Sure How To Stop Africa's Deadliest Ebola Outbreak

When an Ebola outbreak lasts for months and continues to show up in new cities, health officials take notice.  That's exactly what's happening in West Africa. An outbreak that started in Guinea last February has surged in the past few weeks. It's now the deadliest outbreak since the virus was first detected in 1976.

More than 500 cases have been reported in three West African countries, and the death toll has risen to 337, the World Health Organization said Wednesday. That's up from 208 cases reported two weeks ago, a 60 percent spike.  "There are many villages in the eastern part of Sierra Leone that are basically devastated," virologist Robert Garry of Tulane University tells NPR's Jason Beaubien. "We walked into one village ... and we found 25 corpses. One house with seven people, all in one family, were dead...