Why stop there - we can arrange for all Jews to go around with a yelow star stitched on ther clothes ... oh no, someone thought of that.
I know, let's have all travelers have a nice big purple 'D' tattooed on their foreheads, and unemployed people can have a big 'S' for 'shirker' - this idea can run and run!
OK, lets'e be serious now.
Denial, and the spread of HIV, is based on ignorance, and the answer is education. A simple idea, but not likely to see fruition unitl the government puts money into the right end of education - pres-school - and children grow up with a sense of self-worth and respect, for themselves and others.
Anyone who has enough complassion to care about others doesn't become infected, or pretend it hasn't happened. People dpon;t think, don;t lewarn, and don't care - that is the root of the issue, start there.
As for the idea of branding people after the event - well who says we live in a more enlightened society - thank god most of us do!