No, it's not a mutated form, or else it wouldn't have come up as the Sudan strain when they did genetic testing. For example, in 2007, an Ebola outbreak occurred in Bundibugyo, Uganda which came up in tests as Ebola, but also an unknown strain. It was the first new strain in 14 years. Tests for these bugs are very precise. The thing is, Ebola is such a romanticized disease: people tend to focus on the more dramatic presentation of the symptoms like bleeding everywhere when in fact external bleeding only really occurs some of the time...