Abstract: Rarely have humans been as threatened by viruses as they are today. It almost seems as if a virus invasion is taking place. Viruses have lately been coming out of nowhere and appearing in the strangest places — exotic viruses about which no one had ever heard before. Many human viruses have started out in the animal world. Are these viruses maybe escaping from their natural hosts? Are human beings simply available as easy prey? Why is all this happening now, and what does it mean for our future? What can we do to defend ourselves? This book addresses viral adaptation as a general phenomenon and examines the implications for public health of human behavior altering viral ecosystems. This book discusses the phenomenon of viral emergence.

Keywords: viral adaptation, public health, human behavior, viral ecosystems, viral diseases, AIDS, SARS, West Nile