Significant zoonotic diseases have appeared with increasing frequency in recent years. At a symposium held in Galveston, Texas, in March 2004, many outstanding virologists and others presented papers under the broad theme of "emergence." The intent was to elucidate the diseases themselves, the mechanisms by which they have emerged, the publication perception and response to the diseases, and the possibility of prevention or prediction. The papers in this book summarize the talks of this meeting. Among the many timely papers are those by Nobel Prize winner Peter Doherty, influenza epidemiologists Robert Webster and Jeffery Taubenberger, and important contributions by Neal Nathanson, Esteban Domingo, Barry Beaty, David Walker, James Hughes, and others of world expertise.