So Roy, does that mean that this is another disease we've brought on ourselves through 'modern' farming methods?
The other example I can think of is BSE - we (revoltingly) fed sheep remains to cows for many decades before it ever became a problem. However, the old fashioned method involved rendering for long periods of time, which killed the infection, whereas BSE was caused by an 'improvement' in the process to reduce the processing time, hence not killing the Scrapie infection, and hence leading to BSE I believe!