TORONTO (CP) - It could take half a century or more for someone infected with prions - the cause of mad cow-like diseases - to start showing symptoms, say researchers, who drew that conclusion after studying a similar illness among Papua New Guinean people who once feasted on their dead. Their findings suggest that the number of human cases of variant Creutzfeld-Jacob disease (vCJD) could end up being much larger than originally suspected, say the researchers, whose study is published in Friday's edition of The Lancet. With 160 cases, the United Kingdom has the highest number of recorded cases in...