'The condition is very rare amongst heterosexuals in "developed countries"'
That may be so, but one just cannot dismiss the heterosexual sufferers in undeveloped countries. They number millions of men, women and children. The title of the thread doesn't specify '..but not in the Third World". Why are homosexuals in the West being spotlighted here, when the disease is global and if the numbers in Africa etc considered, killing huge numbers of heterosexual people? The thread title also concerns transmission. It's well-known how it's transmitted. Could we perhaps talk about education, prevention and possible scientific advances in immunisation/vaccination, not to mention addressing the social repercussions on orphaned children, sick and dying people without support and even economical adverse effects? Some folk seem obsessed with gay sufferers (and of course, they matter) to the exclusion of all the others.