Covers a range of essential topics from a survey of important historical epidemics to study designs for infectious disease investigations. The first part of the text covers ID epidemiology background and methodology, whereas the second focuses on specific diseases as examples of different transmission modalities. TB, HIV and Influenza are among the pathogens discussed in great detail. Includes four new chapters on immunology, measles, meningococcal disease, and vector-borne infections. The HIV chapter has been expanded to include issues of host genetics as well as a review of behavioral interventions.