Leading infectious disease researchers and pharmaceutical scientists comprehensively review the latest genomic technologies and their application to the prevention, diagnosis, and treatment. The authors' cross-disciplinary approach, with expertise acquired from studying disease-causing viruses, bacteria, fungi, and protozoa, reveals how sequence information from diverse pathogens has uncovered novel targets for drug discovery, antigenic determinants for vaccine development, as well as diagnostic tools. The authors also discuss the application of DNA micoarrays and the impact of genome sequencing comparisons on the discovery and choices of novel drug targets. The result is a better understanding how genomic information can reveal the fundamentals of microbial pathogenesis and how organisms interact with their host environment.