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Comparative Histopathology of Two Serotypes of Infectious Bronchitis Virus (T and N1/88) in Laying Hens and Cockerels

K. K. Chousalkar^*, J. R. Roberts^* and R. Reece

^* Animal Science, School of Rural Science and Agriculture, University of New England, Armidale, New South Wales 2351, Australia; and Elizabeth Macarthur Agricultural Institute, Menangle, New South Wales 2568, Australia

¹ Corresponding author: kchousal{at}une.edu.au

The comparative and sequential histopathology of different tissues of unvaccinated laying hens and cockerels were studied in chickens exposed to T and N1/88 strain of infectious bronchitis virus (IBV). The Harderian gland and trachea of hens and cockerels in both T- and N1/88-infected groups were damaged to a similar extent. The cecum was unaffected for both strains of IBV in both hens and cockerels. The sequential histopathological changes in hens revealed that IBV multiplies initially in the Harderian gland, then in the tracheal mucosa and simultaneously in the kidney and regions of the oviduct such as the magnum, tubular shell gland, and shell gland pouch. In cockerels, IBV multiplies first in the Harderian gland, then simultaneously in the trachea and kidney. Overall, the severity and persistence of lesions were greater in the kidneys of T-infected hens as compared with N1/88-infected hens. However, pathological changes in the kidney were mild in T- and N1/88-infected cockerels.

Key Words: histopathology • infectious bronchitis virus • laying hen • cockerel

This article has been cited by other articles:

				K. K. Chousalkar and J. R. Roberts Ultrastructural Observations on Effects of Infectious Bronchitis Virus in Eggshell-Forming Regions of the Oviduct of the Commercial Laying Hen Poult. Sci., September 1, 2007; 86(9): 1915 - 1919. [Abstract] [Full Text] [PDF]