You may be interested in this talk by Dr. Michael Osterholm http://www.ustream.tv/recorded/53942765/highlight/563746

My main takeaways were (starting 25 minutes in): - There's a lot we don't know, especially about the current strain

- He's heard of patients that did not have a fever through the entire infection

- There have been incidents/experiments where we do not understand how ebola, this strain in particular, passed between animals