Whether an infectious disease agent is an emerging threat, the immune system’s battle against it is usually the first line of defense it encounters. With vaccines and effective treatments often unavailable, the immune system’s efforts to eradicate infectious agents or infected cells are frequently the only means to combat them. Understanding the immune system as well as the infectious agent’s tactics to undermine it is of vital importance to the researcher and clinician. Instead of encylopaedic coverage of every infectious disease agent known, a set of paradigmatic infections were selected on the basis of the depth of available knowledge. This session discusses more about Immunology of Infectious Diseases.