While I'm not doubting the ultimate truth of these claims, the way it is reported here leaves a lot of room for doubt and uncertainty.

It is all speculation and accusation without any evidence either way.

I would have thought that step one would be to isolate and identify the pathogen and see if there is any possible link.

Virii are not a western invention - one of the tribesmen could have contracted the disease in his or her day to day life.

Without the benefits of western medical knowledge, respiratory diseases can well prove fatal.