Using only the laboratory confirmed ebola cases and deaths by my calculations the mortality rate is:
Aug 01 887/1009 =87.90%
July 30 826/953 = 86.67%
July 27 729/909 = 80.19%
feel free to check my arithmetic.
The suspected cases have yet to be verified as being Zaire Ebola.
On August 01 there were 1009 confirmed cases of Ebola reported; of those confirmed cases there were 574 deaths reported. That means 574/1009 = 56.9%.
Alternately, on August 01 there were 1603 total (suspected, probable, confirmed) cases reported; of those total cases there were 887 deaths reported. That means 887/1603 = 55.3%. Do you see now?
You’re not looking at confirmed. Those numbers are all confirmed, probable, and suspect cases. Confirmed is 574/1009.