Two interviews with Dr Mervyn Silverman, from 1988 and 2008. He explains the San Francisco model, how it began and what others can learn from it.

Praphan Phanupak is Professor in Immunology and the Director of the Thai Red Cross AIDS Research Centre (TRC-ARC). He talks about the incidence and prevalence of HIV infection in different parts of Thailand and about human experiments on Thai drug users.