Then again there was probably a lot of chemical manufacturing going on during Sadam's reign.
Here's a hazmat link about yellowcake - http://hazmap.nlm.nih.gov/cgi-bin/hazmap_generic?tbl=TblAgents&id=43
"No grossly observable signs or symptoms were induced in mice, rats, guinea pigs, rabbits, or dogs following the first day of exposure..."
I was thinking this sounds like radiation poisoning, maybe in combination with ground glass in the food and warfarin.