David M Morens; Gregory K Folkers, and Anthony S Fauci Bethesda, MD, USA This article was first published in Lancet Infectious Diseases, Volume 8, Issue 11, Nov. 2008, pages 710-719 Summary Emerging and re-emerging infectious diseases, and their determinants, have recently attracted substantial scientific and popular attention. HIV/AIDS, severe acute respiratory syndrome, H5N1 avian influenza,…