[discostu]

Your first sentence was right. The evidence isn't thin, it's non-existent. There is no evidence at all that prions jump species. BSE hasn't been linked with anything in humans.

[torstars]

BSE hasn't been linked with anything in humans.

Nonsense. Prions from BSE or vCJD produce the same disease in experimental animal recipients and the prions can produce disease through serial transfer. vCJD and BSE are caused by the same bovine prions.