Reovirus-induced tenosynovitis in chickens: the ...



Title Reovirus-induced tenosynovitis in chickens: the effect of breed
Author(s) R. C. Jones, Frederick S. B. Kibenge
Journal Avian Pathology
Date 1984
Volume 13
Issue 3
Start page 511
End page 528
Abstract The effect of breed of chicken on infection with an arthrotropic avian reovirus (strain R2) was studied by oral or footpad inoculation of day-old chicks of the SPF light-hybrid, commercial White Leghorn egg-layer, and commercial Ross I broiler breeds, observed to 12 weeks of age. Although most inoculated birds of all three breeds developed swelling of one or both legs below the hock joint at 3 to 4 weeks of age, gross lesions of tenosynovitis became progressively more severe and extended above the joints only in broilers, whereas in most orally-infected SPF and commercial light chickens gross lesions were intermittently severe and regressed with time. Cloacal virus shedding continued up to 2 weeks in the lighter breeds and 3 weeks after infection in broilers. From a small proportion of infected chickens, reovirus was also recovered from heart, pancreas and caecal tonsils. In all breeds, the tissue in which virus persisted longest was the hock joint/tendon. There was a poor correlation between isolation of virus and the presence of gross lesions in chickens of 12 weeks of age, especially in broilers. Virus-neutralization tests demonstrated that seroconversion in the lighter breeds occurred mainly at 3 weeks, and in broilers at 4 weeks after infection. In all three breeds the footpad infection resulted in poorer growth than in the control and oral-infection groups. Oral infection had no apparent effect on growth rate. The greater susceptibility of broilers to reovirus infection is discussed..

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