November 2001
| Northern Thailand | Chiang Mai HEPS Working Group | Female sex workers |
| Addis Ababa, Ethiopia | Ethio-Netherlands AIDS Research Project | Female sex workers |
| Abidjan, Côte d'Ivoire | Institute of Tropical Medicine, Belgium | Female sex workers |
| Chiang Mai, Thailand | Thai Ministry of Health and US CDC | Serodiscordant couples |
| London, UK | Imperial College/St. Mary's and MRC/Oxford | Serodiscordant couples |
| New Jersey, USA | Gladstone Institute Heterosexual AIDS Transmission Study (HATS) | Serodiscordant couples |
| Lusaka, Zambia | University of North Carolina | Serodiscordant couples |
| Seattle, USA | University of Washington School of Medicine | Serodiscordant couples |
| Source: IAVI Report, September 2001 | ||