It's called AIDS...look into it.
It could be the reason that Suha is getting 22 million per year. That much money can keep even the most greed of people quiet.
If it was AIDS, maybe he passed it onto the many world leaders he has exchanged siliva with over the years. Kofi and Jacque come to mind. It would be poetic justice indeed if he gave his admirers the gift that keeps on killing.