Avian infectious bronchitis virus
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Avian infectious bronchitis virus is a virus that infects poultry. It and its associated disease, avian infectious bronchitis, are usually abbreviated to IBV, which stands for "Infectious bronchitis virus". The related disease is referred to as IB (Infectious bronchitis).
This disease only occurs in chickens. It causes great economic loss by damaging chicken's respiratory, renal, reproductory system for all age.
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[edit] Pathology
[edit] Repiratory system
When virus is inhaled through respiratory tract, virus is attached to ciliated epithelial cells on respiratory tract. Then viral replication starts and viral particles spread into blood vessel in which they causes viremia. This process leads to necrosis of respiratory tract which causes coughing, rale.
[edit] Kidney
Through viremia, some nephrotropic strains (most of them have high virulence) could penetrate into kidney. It causes swelling, urolithiasis in kidney. Grossly, pale color of kidney could be appeared. Microscopically, uric crystals could be found in the renal tubule or ureter.
[edit] Reproductive system
Viremia also lead to reduction of egg productivity. The accumulation of white, sticky exudate could plug cloaca which is referred to as "Pasting". In some cases, ovarian follicle could be found on peritoneal cavity. But this lesion is not specific for infectitive bronchitis. Many acute diseases of layer could lead to that condition.[1]
[edit] References
- ^ "Infectious Bronchitis: Introduction". The Merck Veterinary Manual. 2006. http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/206500.htm. Retrieved on 2007-06-17.
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