I read somewhere that besides the current bigger outbreak in Liberia, there is also a smaller outbreak of ebola in Kongo. The thing is that these strains are not connected. How is that possible? Especially with a dangerous virus like ebola we have a pretty good system to recognize it when it pops up somewhere, and as I understand it has been dormant for some years, until now. Is it just coincidences, or is there a cycle to it somehow?