Emerging diseases and diseases of complex or unknown etiology

Yehia M. Saif, David E. Swayne, Mary J. Pantin-Jackwood, Erica Spackman, Timothy J. Johnson, J. Michael Day, David French, Eric Gingerich, S. F. Bilgili, Kelli Jones, George Boggan, Milos Markis

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Scopus citations


The emergence of new diseases and the re-emergence of recognized diseases are familiar events in the annals of poultry medicine. Some of these emerging diseases could have been present earlier but were not recognized because of low prevalence, mild signs and lesions, lack of diagnostic techniques, or misdiagnosis. This chapter presents information on the complexity of respiratory and enteric diseases. In addition, it presents information on four emerging conditions: white chick syndrome, focal duodenal necrosis in table egg layers, wooden breast and other muscle abnormalities, and idiopathic egg production drops in brown layers. Definitive diagnosis of white chick syndrome involves taking isolates from the affected birds or embryos and putting them back into specific pathogen free embryos to recreate the lesions. Because of the sporadic nature of this syndrome, and relatively short duration of the problem, concern for prevention and control are moderate when compared with more serious threats.

Original languageEnglish (US)
Title of host publicationDiseases of Poultry
Number of pages26
ISBN (Electronic)9781119371199
ISBN (Print)9781119371168
StatePublished - Jan 1 2019

Bibliographical note

Publisher Copyright:
© 2020 John Wiley & Sons, Inc.


  • Commercial poultry
  • Diagnostic techniques
  • Focal duodenal necrosis
  • Idiopathic egg production drops
  • Multicausal enteric diseases
  • Multicausal respiratory diseases
  • White chick syndrome
  • Wooden breast


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