Contributors. -- E.A. Groisman, Preface. -- H. Ochman, Evolution of Bacterial Pathogenesis. -- J.R. Harper and T.J. Silhavy, Germ Warfare: The Mechanisms of Virulence Factor Delivery. -- C.J. Dorman and S.G.J. Smith, Regulation of Virulence Gene Expression in Bacterial Pathogens. -- A. Camilli, D.S. Merrell, and J.J. Mekalanos, Strategies to Identify Bacterial Pathogenicity Factors. -- J.R. Alfano and A. Collmer, Mechanisms of Bacterial Pathogenesis in Plants: Familiar Foes in a Foreign Kingdom. -- A.P. Boyd & G.R. Cornelis, Yersinia. -- C.A. Scherer and S.I. Miller, Molecular Pathogenesis of Salmonellae. -- P.J. Sansonetti, C. Egile, and C. Wenner̄s, Shigellosis: From Disease Symptoms to Molecular and Cellular Pathogenesis. -- J.L. Puente and B.B. Finlay, Pathogenic Escherichia coli. -- V.J. DiRita, Molecular Basis of Vibrio cholerae Pathogenesis. -- T.L. Cover, D.E. Berg, M.J. Blaser, and H.L.T. Mobley, H. Pylori, Pathogenesis. -- S.D. Gray-Owen, C. Dehio, T. Rudel, M. Naumann, and T.F. Meyer, Neisseria. -- P.A. Cotter and J.F. Miller, Bordetella. -- C.M. Tang, D.W. Hood, and E.R. Moxon, Pathogenesis of Haemophilus Influenzae Infections. -- M. Caparon, Pathogenic Mechanisms in Streptococcal Diseases. -- H. Fsihi, P. Steffen, and P. Cosart, Listeria Monocytogenes. -- Index.