Problem-Based Learning Approach in Microbiology is an organ-based study of microbiology and infectious diseases using real patient problems (cases) and cases edited for educational purposes. This approach provides case studies to stimulate interactive learning and facilitate basic knowledge for clinical training. In seven sections, each problem begins with a clinical case scenario that is followed by the learning objectives. The question-and-answer section facilitates student-tutor interaction, thereby resulting in a problem-solving approach. The etiological agent is then described in complete detail, comprising the epidemiology and pathogenicity of the agent, the host immune response, clinical manifestations, and diagnostic and therapeutic measures. This book includes a wide-spectrum of commonly encountered infectious diseases, emerging infectious diseases and immunological diseases. It caters to the need for fundamental knowledge through an alternative approach achieved by dividing the book into sections and facilitates a more effective learning process.