I. Molecular Structure of the Arenaviruses.- 1 Arenavirus Ultrastructure and Morphogenesis.- 2 Glycoproteins of the Arenaviruses.- 3 Antigenic Diversity among the Arenaviruses.- 4 Genetic Organization of Junin Virus, the Etiological Agent of Argentine Hemorrhagic Fever.- 5 Genetic Variation in Junin Virus.- 6 The Unusual Mechanism of Arenavirus RNA Synthesis.- 7 Subgenomic RNAs of Tacaribe Virus.- 8 Molecular Biology of the Prototype Arenavirus, Lymphocytic Choriomeningitis Virus.- 9 Arenavirus Replication: Molecular Dissection of the Role of Viral Protein and RNA.- 10 Molecular Phylogeny of the Arenaviruses and Guide to Published Sequence Data.- II. Immunopathology, Vaccines, and Epidemiology.- 11 Lymphocytic Choriomeningitis Virus: History of the Gold Standard for Viral Immunobiology.- 12 Influence of Host Genes on the Outcome of Murine Lymphocytic Choriomeningitis Virus Infection: A Model for Studying Genetic Control of Virus-Specific Immune Responses.- 13 Molecular Anatomy of the Cytotoxic T-Lymphocyte Responses to Lymphocytic Choriomeningitis Virus.- 14 Virus-Induced Acquired Immunosuppression by T-Cell-Mediated Immunopathology and Vaccine Strategies.- 15 Construction and Evaluation of Recombinant Virus Vaccines for Lassa Fever.- 16 The Tacaribe Complex: The Close Relationship between a Pathogenic (Junin) and a Nonpathogenic (Tacaribe) Arenavirus.- 17 Arenavirus Pathophysiology.- 18 Lassa Virus and Central Nervous System Diseases.- 19 Ecology and Epidemiology of Arenaviruses and Their Hosts.