HIV and sexual behaviour amongst widows and widowers in Manicaland, Zimbabwe, 1998/2003 • Benjamin A. Lopman, Imperial College ; Constance Nyamukapa, Biomedical Research & Training Institute ; Costa Mundandi, Biomedical Research & Training Institute ; Simon Gregson, Imperial College

HIV infection among young women: the healthy carrier hypothesis • Michel Garenne, Institut de Recherche pour le Développement (IRD)

Time at risk: use of data on transitions between risk categories to explain individual HIV status and community HIV prevalence levels • Basia Zaba, London School of Hygiene and Tropical Medicine ; Milly Marston, London School of Hygiene and Tropical Medicine ; Emma Slaymaker, London School of Hygiene and Tropical Medicine ; Mark Urassa, National Institute for Medical Research of Tanzania ; Andreas Jahn, Karonga Prevention Study ; Mia Crampin, London School of Hygiene and Tropical Medicine ; Raphael Isingo, National Institute for Medical Research of Tanzania

Making progress in understanding the uneven distribution of HIV infection: lessons learned from the priorities for local AIDS control efforts "PLACE" method • Sharon Weir, University of North Carolina at Chapel Hill ; Jacqueline E. Tate, University of North Carolina at Chapel Hill

Unprotected sex in an STD clinic population: agreement between self-reported condom use and PCR detection of y-chromosome in vaginal fluid • Alia A. Al-Tayyib, University of North Carolina at Chapel Hill ; William Miller, University of North Carolina at Chapel Hill ; Jonathan M. Zenilman, Johns Hopkins University