RESULTS: Populations at risk have increased P .024 and the geographical extent of Ebola outbreaks has grown P .004 . Reporting time of the first cases of Ebola to WHO has been reduced P .017 and case fatality P .028 has gone from 88 to 62 in the period studied. There have been differences P .04 between the outbreaks produced by the Sudan and Zaire strains of the virus, both in terms of duration and case fatality ratio Sudan strain 74.5 days on average and 62.7 of case fatality ratio versus Zaire strain with 150 days on average and 55.4 case fatality ratio . ...