Opportunistic, intracellular bacterial infections are at the forefront of research because of the challenges they present to immunocompromised patients. In this volume, the pathogenesis and immune reaction of these intracellular infections is featured, as are the most typical problems related to antimicrobial chemotherapy, and current approaches to their solution. Individual chapters set the pace for research on pathogenic and immune reactions to such infections as, mycobacterium tuberculosis, legionella pneumophila, chlamydia trachomatis and brucella.