Since February, this virus has spread over three countries in western Africa and at the time of this writing has claimed the lives of over 400 people. Currently, a U.S. citizen is being tested for the virus and has been placed in quarantine in Ghana after travelling through two of the affected countries.
For more information: BBC - Ebola Outbreak
This outbreak is not contained and will likely spread before we see it brought under control. To get a sense of what may be at stake here, read The Hot Zone, by Richard Preston. It details an incident that occurred in 1989 where a similar outbreak almost occurred in the U.S.