Here's some good news for the holidays--there's a chance that we may never see another large Ebola outbreak. That is, if a new vaccine lives up to its billing. 

This week, the medical journal The Lancet published results of a trial that tested the vaccine on nearly 12,000 people in a coastal region of Guinea. 

Reseachers say it was 100 percent effective in preventing transmission of the Ebola virus.

To understand what this might mean, Libby Denkmann spoke to Dr. William Schaffner, professor of preventive medicine & infectious diseases at Vanderbilt University Medical Center. 

To listen to the full interview, click on the blue media player above.