also if he is hiv+ there is special treatment he would need in order to live a reasonably healthy life, and that is not available in Qatar unless you are Qatari, and not many people would have the balls to try and smuggle that in.

If he goes without treatment he could have major health problems, which will show in his performance at the work place, and eventual result will be termination, in which case he would have to leave anyway. Option are pretty much, stay and get screwed, or go and get sorted the best he can.