XIX International AIDS Conference in Washington D.C. Barton Haynes from the Duke Human Vaccine Institute (DHVI) has been working in the HIV vaccine field since 1985. Here he talks about the scientific difficulties of finding an HIV vaccine.

David Klatzmann is a french immunologist who has been working in an AIDS group in France since 1981. He talks about the discoveries that CD4-antigens function as receptors for the HIV virus and explains the structure of this relationship in detail.