According to the CDC and my sister that is a MD Pathologist patients maintain an immunity to the strain they were infected with up to and over 10 years. There is a reason they are giving transfusions of recovered patients to newly sick one, that is because they already have the anti-body that fights the virus.
BUT there are several varieties of hemorrhagic fevers in Africa and elsewhere.....Ebola is just one. Marburg and a few others are floating around in the bush-meat population.
Thanks for the info. That jibes with what I had always heard, as well as what's generally true for most (although not all) viral diseases.