Genetic Analysis of Bacterial Pathogenesis.- Genetic Exchange in Bacteria and the Modular Structure of Mobile DNA Elements.- Genomics and the Use of Genomic Tools to Study Pathogenic Bacteria.- Pathogenicity Islands and Bacterial Virulence.- Capsules.- Bacterial Cell Walls.- Mechanisms of Bacterial Adhesion and Consequences of Attachment.- Bacterial Invasion into Non-Phagocytic Cells.- Bacterial Protein Secretion Mechanisms.- Toxins as Host Cell Modulators.- Quorum Sensing: Coordinating Group Behavior Through Intercellular Signals.- The Role of Sigma Factors in Regulating Bacterial Stress Responses and Pathogenesis.- Two-Component Regulatory Systems.- Oxidative Stress Systems in Bacteria: Four Model Organisms.- Bacterial Biowarfare Agents.