Nigeria is successful because the government there made people aware (and very afraid) of the Ebola disease. They quickly provided posters and pamphlets all around the major cities on how to prevent contracting the disease. People entering any shops in Lagos had their temperatures checked, there were hand sanitizers everywhere, etc ... Contrary to this approach, very early on in the Thomas Duncan fiasco, US officials convinced Americans that compared to "rural West Africa" (this is exactly how one top Dallas healthcare official so condescendingly put it), the United States was in far better shape to handle this crisis. So even till now there are none of the basic precautions (temperature screenings at airports, basic hygiene measures) being taken in the index city - Dallas - and many other American cities.

Dr. Kish is one of my professors and a renowned expert on noise. Its indeed possible that where complex cryptography have failed, a solution outside the "box" will indeed proffer a viable solution. afterall, there's always analog solution to every problem.