Somebody should consider buying them a subscription to the New England Journal of Medicine, because that's not what widely cited peer reviewed studies say.
Phylogenetic analysis of the full-length sequences established a separate clade for the Guinean EBOV strain in a sister relationship with other known EBOV strains. This suggests that the EBOV strain from Guinea has evolved in parallel with the strains from the Democratic Republic of Congo and Gabon from a recent ancestor and has not been introduced from the latter countries into Guinea.
Later refuted:
http://www.nejm.org/doi/full/10.1056/NEJMoa1404505?query=featured_ebola
There is no separate ebola guinea strain.
A rose by any name...
The strain in Dallas is the Killer Strain. Call it what you like.