Table 1.
Pathological lesions of 15 × 7 birds inoculated with wild-type (Md5) and recombinant (rMd5, rMd5Δpp38) MDV viruses
| Virus | Gross lesions†
|
Microscopic lesions‡
|
|
|---|---|---|---|
| Visceral | Nerve | Vagus nerve | |
| None | 0/20 (0)* | 0/20 (0) | ND§ |
| rMd5Δpp38-19 | 1/19 (5.3) | 5/19 (26) | 9/19 (47) |
| rMd5Δpp38-24 | 0/21 (0) | 6/21 (28) | 11/21 (52) |
| rMd5 | 13/20 (65) | 20/20 (100) | ND |
| Md5 p8 | 5/12 (41) | 12/12 (100) | ND |
*
Data in parentheses indicate percentage of birds affected.
†
Visceral lesions indicate gross tumors, and nerve lesions are gross enlargements of the vagus, sciatic, or the brachial plexus.
‡
Lymphocytic infiltration of the vagus nerve.
§
Not all the nerves were examined microscopically. ND, not determined.