The field of veterinary bacteriology plays an important role in veterinary medicine and human health. Veterinary bacteriology is the study of bacteria found in animal species. These bacteria can either be pathogenic or non-pathogenic and can cause infectious diseases in animals. Bacteria are classified into different categories on the basis of their nature and uniqueness. The use of biochemical tests for characterization and identification of bacteria is very helpful to understand their nature and characteristics. An infectious bacterial disease could be specific to an organ. Mastitis, collibacillosis in cattle, enterotoxaemia, infectious necrotic hepatitis and para tuberculosis in sheep, greasy pig disease and pneumonia in pigs are some of the common bacterial diseases. The book studies, analyses and upholds the pillars of veterinary bacteriology and its utmost significance in modern times. It also brings forth some of the most innovative concepts and elucidates the unexplored aspects of this field. This book will help new researchers by foregrounding their knowledge in veterinary bacteriology.