Really?? Look at any map recording the history of Ebola outbreaks of any demographic significance. There are clear north and south borders suggested, paralleling specific latitudinal lines, centering in the middle tropics of the African continent, and this over many decades. I'd classify that as constituting at least some basis for concluding that its nature it that of a tropical disease.
You probably would classify it that way because you just haven't got the intellectual wherewithal to understand these are both diseases of humans, and that all humans are susceptible and they are not confined anywhere on the planet. You cannot have it both ways, either the disease presents a danger here or it does not.