A record number of scientific studies, focusing on developments in treatments, vaccines and basic science, will be presented.
This year, research has been submitted by scientists in 114 countries.
Delegates hope the meeting will give developing nations the drive to tackle HIV/AIDS head-on.
In the early 1990's, Brazil's AIDS crisis was very similar to South Africa's. Today, however, six million South Africans are infected with HIV, while in Brazil this number has dropped to 600,000, with everyone having access to AIDS drugs.
Brazil has implemented safe sex campaigns and treatment awareness. It produces its own generic drugs, guaranteeing free treatment to its population and exporting to countries in need.
Delegates from the developing world are being given a reduced attendance fee to ensure issues that affect these countries are addressed at the conference.
