All the book chapters were updated. There is one less chapter in this edition; some chapters were combined; and a new chapter was created. These changes were dictated by the increasing or decreasing significance of some diseases or the increasing knowledge on a given disease. Some subchapters have been moved to different chapters because of recent findings indicating that they
fit within different areas.
The last chapter, “Emerging Diseases and Diseases of Complex or Unknown Etiology,” has always been in a state of flux because of the nature of the topics included. Two subchapters of this chapter in the eleventh edition, labeled “Big Liver and Spleen Diseases” and “Hepatitis Splenomegaly,” were recently associated with avian hepatitis E virus infection and moved to Chapter 14. In addition, the subchapter on viral proventriculitis was moved to this chapter because of the uncertainties of the etiology of the disease. The subchapter, “Poult Enteritis and Mortality Syndrome,” was combined with the subchapter, “Multicausal Enteric Diseases,” in recognition of the fact that it is a condition
resulting from multiple infections. Chapter 1 was split in two, and a new chapter, “Host Factors for Disease Resistance,” was created. This was done in recognition of the importance of the subject matter for a book on diseases and because of the increasing knowledge on the subject. The chapter on avian encephalomyelitis was combined with Chapter 14 in which coverage of similar infections is placed. The chapter on bordetellosis was combined with the chapter on pasteurellosis and other respiratory bacterial infections.
fit within different areas.
The last chapter, “Emerging Diseases and Diseases of Complex or Unknown Etiology,” has always been in a state of flux because of the nature of the topics included. Two subchapters of this chapter in the eleventh edition, labeled “Big Liver and Spleen Diseases” and “Hepatitis Splenomegaly,” were recently associated with avian hepatitis E virus infection and moved to Chapter 14. In addition, the subchapter on viral proventriculitis was moved to this chapter because of the uncertainties of the etiology of the disease. The subchapter, “Poult Enteritis and Mortality Syndrome,” was combined with the subchapter, “Multicausal Enteric Diseases,” in recognition of the fact that it is a condition
resulting from multiple infections. Chapter 1 was split in two, and a new chapter, “Host Factors for Disease Resistance,” was created. This was done in recognition of the importance of the subject matter for a book on diseases and because of the increasing knowledge on the subject. The chapter on avian encephalomyelitis was combined with Chapter 14 in which coverage of similar infections is placed. The chapter on bordetellosis was combined with the chapter on pasteurellosis and other respiratory bacterial infections.
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