Again, AIDS is not universally more common in Africa. Again, Russia, ukraine and several East European nations have HIV/AIDS rates more than twice as much as that of Somalia's and the rest of "Islamic" Black Africa. Prevalence rate: Somalia: 0.5% Russia: 1.01% http://en.wikipedia.org/wiki/List_of...revalence_rate (both are 2001 estimates) So Russians are twice as likely to be HIV positive compared to Somalis. Screening Somalis and not screening Russians goes against your desire to be cost effective.