MSF Q&A on Mortality:
This outbreak seems to be much more lethal than past cases of Marburg.
It is very surprising. We will have to answer this question. It is possible that it has appeared very lethal because we have only had records of cases in a terminal stage and mainly among young children who are more vulnerable. Now that MSF team has reorganized the Uige isolation unit, it will allow the treatment of infected people in an early stage. The percentage of fatality could then hopefully decrease, although the case definition does influence the results
http://www.doctorswithoutborders.org/publications/voices/2005/angola_4-2005.shtml
If you search the web you'll find the comment about the 1 released patient. Apologies, but don't have much time at work to look for it. There is only one official press release noting that 1 person survived. There could, of course, be other survivors that were not mentioned in the released--but that seems unlikely.
Ah yes thank you for this post, it seems that the measurements are not yet made. The corect metric is always a factor in determining virulence and mortality. This was precisely my point when i asked this question. i pray for the sake of those people that we see a drop in fatalities as a result.