Vaccination is widely recognized as one of the most efficient tools in public health, showing obvious cost-benefit advantages for all target populations involved. Vaccines in the veterinary field can contribute greatly to the welfare of domestic and wild animals and, indirectly, to environmental protection. The aim of animal vaccination will increasingly be to prevent dissmenination of zoonoses (such as rabies, taeniosis, and salmonellosis) rather than to protect the animal itself, especially when infection or infestation is not harmful to the reservoir (cysticercosis). At present, the book argues, there is insufficient overall understanding of some important aspects of veterinary vaccines, and it seeks to address this. The scope is broad and covers all aspects of vaccines and vaccination in the animal health sector.