Cells and molecules of the immune system, mediators, chemokines, cytokines and receptors, innate and adaptive immunity, man and microbes, microbial pathogens, portal of entry and pathogenesis, host cell surface for pathogen interaction, cell adhesion and adhesins-mediated signaling, mechanisms of microbial invasion, intracellular spreading of pathogens, microbial toxin and mechanism of action, bacterial secretory system, interaction of pathogens with host cells and their effects, interaction of pathogens with innate and adaptive immunity, evasion of immunity by microbial pathogens, prevention and treatment of infectious diseases, induction of apoptosis by microbial pathogenesis, antimicrobial agents and mechanism of drug resistance, epidemiology of infectious diseases, tropical diseases, emerging diseases, biosafety and related-law, cases studies