Abstract
Evaluation was made of the pathogenicity for the oviduct of Massachusetts (Mass) serotype, strain 33, of infectious bronchitis virus (IBV) of two different embryo-passage levels, respectively 7th and 55th. Also ascertained was the susceptibility of chickens exposed at different ages. Three parameters were evaluated: gross lesions, microscopic pathology, and the localization of viral antigen in the oviduct by immunofluorescence. The chickens were 1, 8, 15, 22, and 29 days old at inoculation. Both embryo-passage levels of Mass serotype IBV were pathogenic for the oviduct. The embryo-passage levels varied in ability to produce pathological changes in the oviduct. Low-passage virus produced more lesions than high-passage virus. The high-passage virus produced severe lesions only in chickens inoculated at 1 and 8 days old, whereas the low-passage virus also caused damage in older chickens. Viral antigen was localized in the epithelial cells lining the oviduct following inoculation of either virus passage. Invasiveness of the oviduct was less with the high-embryo-passage virus. There was a positive correlation between lesions and localization of viral antigen in the oviduct.
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