Nephritis associated with infectious bronchitis virus Cal99 variant in game chickens

M. França, P. R. Woolcock, M. Yu, M. W. Jackwood, H L Shivaprasad

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Infectious bronchitis virus (IBV) Cal99 variant was isolated from the kidneys of seven 2-5-mo-old game chickens with nephritis and respiratory disease. IBV Cal99 variant is usually associated with respiratory disease in broiler chickens in California. Macroscopically, the majority of the birds had moderately to severely enlarged and mottled pale kidneys, with increased urates in the ureters. Microscopically, most of the birds had acute nephrosis and interstitial nephritis. The birds also had sinusitis, tracheitis, bronchopneumonia, airsacculitis, salivary gland adenitis, and lymphoid depletion in the thymus and bursa of Fabricius. Immunohistochemistry was strongly positive for IBV antigen in the cytoplasm of tubular epithelial cells in the kidneys and also in the epithelium of the respiratory tract, salivary glands, proventriculus, intestine, and bursa of Fabricius. Infectious bronchitis virus was isolated from the trachea, lungs, kidneys, and cecal tonsils. Sequencing of the hypervariable region of the S1 gene of the kidney IBV isolate, designated IBV/CA99variant/07, revealed that the virus was 98% homologous to the Cal99 serotype of IBV.

Original languageEnglish (US)
Pages (from-to)422-428
Number of pages7
JournalAvian Diseases
Issue number3
StatePublished - Sep 2011


  • Cal99 variant
  • infectious bronchitis virus
  • nephritis

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Food Animals
  • Immunology and Microbiology(all)


Dive into the research topics of 'Nephritis associated with infectious bronchitis virus Cal99 variant in game chickens'. Together they form a unique fingerprint.

Cite this