News reports of hysteria, dontcha know. We all read about the people in Incline Village and then immediately worked on generating those symptoms (which were described in perfect and medically-accurate detail in the reports, of course.)
I first met an Indonesian colleague in late 2014 (I was living in Australia and I and my two children had developed ME/CFS in 2013 - yes, I was still working part-time which involved international travel for a week or so at a time....) After a few months I found out that her son had symptoms that exactly matched ours.
He had initially been admitted to hospital with suspected appendicitis in 2013 and had had his appendix out, which turned out to be fine. My daughter had been admitted to hospital with suspected appendicitis in 2013 but after 3 days it was decided that it wasn't that and she came home. My son and I had had a similar gastroflu/stomach pain thing about two weeks later.
After having his appendix out, the Indonesian boy (aged 14, the same age as my son) then had exactly the same issues with joint pain, with standing upright, with fatigue, sore throats, headaches, gastro issues that we developed after our severe stomach pain.
This boy has minimal English language capability. I don't think he had been reading reports of Incline Village and thinking - ah, this sounds like a good lark.
Or else, we knew instinctively, through the part of our brain that controls 'illness beliefs' just what would be debilitating enough to confine us to our beds, but ephemeral enough that it would be nearly impossible to be taken seriously.
So this possibility seems more plausible.
I personally like the idea of cross-cultural telepathy, where different languages are no constraint combined with a masochistic tendency to want to lose much of what we loved about our lives and have people think we are lazy/crazy. This would neatly cover all those post-Ebola people in African countries also experiencing ME/CFS-like problems.
Edited to add: My daughter, who was first to get the severe stomach pains in our family had spent a couple of weeks in a fairly obscure Indonesian town staying with a colleague of mine, about a month before she became ill. It just so happens that that was the very same town that the Indonesian boy now with ME/CFS symptoms, the son of another colleague of mine, comes from... Although, my daughter has never met the Indonesian boy.