" ...the motto for the therapeutics of the future will have to be de sedibus et causis pharmacorum. " P. EHRLICH, 1909 Exciting events in the basic disciplines of virology, immunology, and pharmacology continue to advance the understanding of the pathogenesis and control of virus diseases. At the same time, the rational development of antiviral agents is attracting, to an increasing extent, the interest of workers in other disciplines. Improvements in technology facilitate the definition of potential target sites for antiviral intervention and unmask new viral and host genes. The outcome is a...