The teaching and learning of immunology has always been a difficult objective, but the experts in the field believe it can be an interesting area of study if people are taught in a manner that will give them a maximum understanding.One way of going round this problem is presenting lectures in a digested form. This way, people with limited science background could easily learn and understand the subject. This book is bringing immunology to first timers in a more digested form. It is a compilation of lecture notes that span across two important topics namely: autoimmunity and hypersensitivity. It is believed this book will help to remove the fear of students for whom immunology has become a no go area but who must obtain a pass in it as part of their course of study.