Coexistence of Infectious Bronchitis and Infectious Laryngotracheitis

Lg, Raggi; Asmar, Joëlle; Gg, Lee

doi:10.2307/1588189

Cited by 1 publication

(1 citation statement)

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“…They found that when IBV was given to chickens with NDB1 vaccine, there was subsequently no production of haemagglutination-inhibition (HI) antibodies to NDV, but NDV did not interfere with IBV infection. Raggi et al (1967a) found no synergism between IBV and infectious laryngotracheitis virus (ILTV), but Pattison et al (1971) reported that aerosol vaccination with IBV increased the mortalities due to ILTV. APV, the cause of TRT and mild respiratory disease in chickens may also occur in respiratory outbreaks involving IBV, but the significance of these two agents being present together is yet to be reported.…”

Section: Other Respiratory Virusesmentioning

confidence: 99%

Infectious bronchitis virus: Immunopathogenesis of infection in the chicken

1997

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SUMMARYThe immunopathogenesis of infectious bronchitis virus (IBV) infection in the chicken is reviewed. While infectious bronchitis (IB) is considered primarily a disease of the respiratory system, different IBV strains may show variable tissue tropisms and also affect the oviduct and the kidneys, with serious consequences. Some strains replicate in the intestine but apparently without pathological changes. Pectoral myopathy has been associated with an important recent variant. Several factors can influence the course of infection with IBV, including the age, breed and nutrition of the chicken, the environment and intercurrent infection with other infectious agents. Immunogenic components of the virus include the S (spike) proteins and the N nucleoprotein. The humoral, local and cellular responses of the chicken to IBV are reviewed, together with genetic resistance of the chicken. In long-term persistence of IBV, the caecal tonsil or kidney have been proposed as the sites of persistence. Antigenic variation among IBV strains is related to relatively small differences in amino acid sequences in the S1 spike protein. However, antigenic studies alone do not adequately define immunological relationships between strains and cross-immunisation studies have been used to classify IBV isolates into 'protectotypes'. It has been speculated that changes in the S1 protein may be related to differences in tissue tropisms shown by different strains. Perhaps in the future, new strains of IBV may arise which affect organs or systems not normally associated with IB.

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Section: Other Respiratory Virusesmentioning

confidence: 99%