Polygyny and the spread of HIV in sub-Saharan Africa • Georges Reniers, Princeton University ; Jeff Eaton, Imperial College

Older people’s sexual behaviour and HIV risk in five high prevalence sub-Saharan African populations • Nuala McGrath, London School of Hygiene and Tropical Medicine (LSHTM) ; Raphael Isingo, National Institute for Medical Research, Tanzania ; Ben Lopman, Imperial College London ; Ivan Kasamba, Medical Research Council Programme on AIDS ; Milly Marston, London School of Hygiene and Tropical Medicine (LSHTM) ; Joseph Sekasanvu, Rakai Health Science Program

Age at second sex: a determinant of HIV transmission • Emma Slaymaker, London School of Hygiene and Tropical Medicine (LSHTM) ; Nuala McGrath, London School of Hygiene and Tropical Medicine (LSHTM)

Is ABC enough to explain Changes in HIV Prevalence in rural Uganda? • Jim Todd, London School of Hygiene and Tropical Medicine (LSHTM) ; Dermot Maher, MRC/UVRI Uganda Research Unit on AIDS ; Heiner Grosskurth, MRC/UVRI Uganda research Unit on AIDS