The 29 papers contained in this volume look closely at various aspects of what is termed, "The Maternal-Fetal Interface," as it relates to the latest research in placental science. A substantial section of the book is devoted to the troublesome question of vertical transmission of infectious agents: namely, the HIV-1 virus. However, other sections of the volume examine related issues such as drug and toxin transfer across the term placenta and the diversity of placental types and how this can affect a placenta's effectiveness as a barrier. Anthony Carter is at the University of Odense, Denmark Vibeke Dantzer is at the University of Copenhagen, DenmarkThomas Jansson is at the University of Gothenburg, Sweden