AIDS originated in Africa, the most serious AIDS in Africa, most infected people, then find where he died of AIDS virus carriers and more examples should also seek to Africa.

There are tests that look for HIV's genetic material or proteins directly; these may also be used to find out if someone has been infected with HIV.

After more than two decades of research those labouring to find a vaccine against HIV, the virus that causes the disease, have found a method that might actually work.