I can provide the preliminary answer, maybe.
The issue of compliance with the feed ban of 1997 is a key factor in the elimination of BSE. The agency never had any illusion, when it implemented its feed ban in 1997, that it would take care of all infectivity in all females in all rendering plants and all that. That's why we've introduced a second part to the feed ban, which is the removal of SRM material from the feed chain so you actually remove it from the source. Then you don't have to worry about cross-contamination within the system.
Now the cases of BSE that Canada has in fact demonstrate that there was, at the time the feed ban was implemented, some infectivity in the system, which has probably been distributed to some farms. We think it's low infectivity, given the age of the cows we've noticed so far. The latest one is 66 months old, so for us it means a low-infectivity dose. Hopefully, with the new measures, the agency predicts that in 10 years' time, within a decade, we shouldn't be seeing any more cases of BSE.
Now, having a surveillance system that works, we will find some BSE cases. In any country that has a system of surveillance that is based on risk we will find cases of BSE.