Toxicology and immunology explore the infections, diseases, agents as well as antidotes affecting living organisms and form a crucial part of veterinary sciences. Over the past few decades, remarkable progress has been made in these disciplines. This book lucidly discusses topics like evaluation of new vaccines, systemic immunology, infections, host-pathogen interactions, etc. The students of veterinary sciences and veterinary pathology will find in this book an ideal guide. It will enable them to arrive at a comprehensive diagnosis. This book strives to provide a fair idea about this discipline and helps develop a better understanding of the latest advances within this field.