If you basically had a list that made it obligatory to test anyone from a country's whose HIV/AIDS prevalence rate is say, more than 1.5% or whatever figure you feel might accurately screen for AIDS whole still remaining cost effective, wouldnt that be a wiser decision than condemning ALL of Sub Saharan Africa, where some countries do have alarming rates, while others have prevalence rates equivalent to Asian and LatinAmerican rates, and others to European and North American rates...don't you think you're being a tad inefficient?