One of the tenets for minimizing the risk of spreading Ebola Virus has been a 21-day quarantine period for individuals who might have been exposed to the virus. But a new study suggests that 21 days might not be enough to completely prevent spread of the virus. Experts say there could be up to a 12 percent chance that someone could be infected even after the 21-day quarantine.

http://www.sciencedaily.com/releases/2014/10/141015112323.htm