The live microorganisms which have a beneficial effect on the health of an individual upon their consumption are known as probiotics. The microbial strains which are responsible for the beneficial regulation of the mucosal immune system are collectively known as immunobiotics. They can be used to treat and reduce the severity of numerous diseases and infections in animals and humans. A few of such diseases and infections are allergies, obesity, immunosuppression, intestinal infections and inflammatory bowel disease. Studies have also shown that a few immunobiotic strains are able to regulate the immune-coagulative responses in the respiratory tract and thereby decrease the severity of viral disease. The bioactive compounds present in immunobiotics are termed as immunogenics. This book unravels the recent studies in the field of immunobiotics and immunogenics. Also included herein is a detailed explanation of the various cellular and molecular interactiosn in immunobiotics. Those in search of information to further their knowledge will be greatly assisted by this book.