TABLE 2.
Gross and microscopic lesions in the BF from chickens infected with rD78 or rD78NSΔ IBDV
| Day postinfection | Group | Pathology
|
|
|---|---|---|---|
| Grossa | Microscopicb | ||
| Control | − | − | |
| 2 | rD78 | − | ++ (4/8) |
| rD78NSΔ | − | − | |
| Control | − | − | |
| 4 | rD78 | − | +++ (6/8) |
| rD78NSΔ | − | − | |
| Control | − | − | |
| 6 | rD78 | + | +++ (8/8) |
| rD78NSΔ | − | − | |
| Control | − | − | |
| 9 | rD78 | + | +++ (7/8) |
| rD78NSΔ | − | − | |
| Control | − | − | |
| 21 | rD78 | − | − |
| rD78NSΔ | − | − | |
a
−, no gross lesion; +, small bursa.
b
−, no histological lesion; + to +++, degree of extent of multifocal purulent necrotizing bursitis with follicular depletion. Numbers in parentheses represent number of bursa with lesions/number of bursa examined. The result is the representative of two independent experiments.