Researchers are trying to link BSE with Variant Creutzfeldt-Jakob Disease (vCJD), not CJD itself. CJD is relatively common but vCJD is very rare. They have found a causative link between the two and think they might use the same transmission mechanism. Remember, causative link are like saying that "killing turkeys causes winter." We know that vCJD and BSE are transmitted from one organism to another in a similar fashion, so it might be due to the same prion. Now this may or may not be true, its just their hypothesis right now. Even if it is true, there has been no evidence of this prion in any meat of infected animals, just in nervous tissue. So if your worried, stop eating cow brains and spinal cords. There are removed in canada during slaughter anyways, so its not really a concern.
As for the worry about how many people have been killed by BSE in Canada or the USA, the answer is none. Zero. And even if that number increases by 1000% it will still be ZERO. How many people have been made sick or killed over the holidays by food safety outbreaks? Thousands. Millions. Perhaps the money spent on BSE so far would be far better spent increasing the safety of cooked foods. Teaching people how to properly handle dangerous chicken, beef, and pork when they get it home from the slaughterhouse. Installing $1.00 thermometers in everyones refridgerator.