This book comprises a collection of categorized case-based questions, directed and meticulously selected to cover the most common and most important aspects of immunodeficiency diseases. Immunodeficiency disorders of infancy and childhood such as antibody deficiencies, phagocyte defects and defects in innate immunity are addressed among others. Each chapters starts with a brief of the initial presentation and lab data of the patient, followed by a series of 5-6 multiple choice questions (MCQs), leading the reader to the diagnosis and best of practice in a step-wise manner. This MCQ format along with precise, yet detailed answer ensures a quick, case-based, reality learning to the reader. This comprehensive MCQ series, is an essential reading material that a pediatric clinician, hematologist, immunologist, transplant specialist, or pulmonologist, can not afford to miss.

Nima Rezaei, is a MD, PhD in Clinical Immunology and Human Genetics. Having finished his PhD he was awarded a fellowship in Clinical Immunology and Bone Marrow Transplantation, Paediatric Immunology and Infectious Diseases in Northern Supra Regional Bone Marrow Transplant Unit for SCID and Related Disorders, Newcastle General Hospital. He has since authored more than 500 publications, including the Springer, 'Primary Immunodeficiency Diseases', Immunology of Aging' and 'Cancer Immunology' series, to which he was awarded the 10 th , 16 th and 17 th Avicenna Award for the book of the year. He was recognized as the distinguished young researcher to the prestigious Rhazi Award in in Medical Science Research on 2006 and 2012. In 2017 he was recognized by the National Academy of Medical Sciences, as 'Iran's Best Medical Researcher of the Past Decade''. Iranian Primary Immunodeficiency Diseases Registry (IPIDR) since 1999, having more than thousands of PID and Paediatric Allergology and Immunology registered, is indeed one of his great scientific legacies.