1.General Principles -- Bibliography -- 2.Attachment to and Entry of Microorganisms into the Body -- 3.Early Stages of Infection After Pathogen Entry -- 4.Encounter of Microbes with Phagocytic Cells -- 5.The Spread of Microbes Through the Body -- 6.The Immune Response to Infection -- 7.Microbial Strategies in Relation to the Immune Response -- 8.Mechanisms of Cell and Tissue Damage -- 9.Recovery from Infection -- 10.Failure to Eliminate Microbe -- 11.Host and Microbial Factors Influencing Susceptibility -- 12.Vaccines and How They Work -- Appendix -- Conclusions.