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Related Experiment Videos

The pathogenesis of quail bronchitis

S W Jack1, W M Reed, T Burnstein

  • 1Department of Veterinary Pathobiology, School of Veterinary Medicine, Purdue University, West Lafayette, Indiana 47907.

Avian Diseases
|July 1, 1994
PubMed
Summary

Quail bronchitis virus rapidly spreads through bobwhite quail tissues, peaking in titer and causing significant respiratory lesions by day 4-6 post-inoculation. Lesions include epithelial damage and inflammation in the trachea and bronchioles.

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Area of Science:

  • Avian Pathology
  • Virology
  • Immunology

Background:

  • Quail bronchitis virus (QBV) is a significant pathogen in young bobwhite quails.
  • Understanding QBV's pathogenesis is crucial for disease management in poultry.

Purpose of the Study:

  • To determine the viral fate and lesion development of QBV in bobwhite quails.
  • To characterize the temporal progression of QBV infection and host response.

Main Methods:

  • Intratracheal inoculation of 1-week-old bobwhite quails with QBV.
  • Sequential necropsy and tissue sampling at various time points post-inoculation (2 hours to 10 days).
  • Virus isolation, titration, and histopathological examination of tissues.

Main Results:

  • Virus isolation occurred as early as 2 hours PI in lungs, spreading to other organs by 8 hours PI.
  • Peak virus titers (days 4-6 PI) correlated with severe histologic lesions in the respiratory tract.
  • Lesions included tracheal and bronchiolar epithelial damage, deciliation, and significant leukocytic infiltration.

Conclusions:

  • QBV disseminates rapidly within bobwhite quails, leading to acute respiratory disease.
  • The observed histopathological changes reflect a severe inflammatory response to viral infection.
  • Early viral replication and subsequent tissue damage are key features of QBV pathogenesis.

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