Induction of Marek’s disease following injections of T5 and T9 cell lines
| Cellular strains | Age at necroscopy (weeks) | Chickens with macroscopic lesions/injected ones (%) | Chickens with macroscopic lesions/contact ones (%) |
|---|---|---|---|
| T5 | 11 | 4/8 (50) | 4/6 (66) |
| Early T9 | 6–8 | 8/9 (88) | 5/6 (83) |
| Late T9 | 6–13 | 0/9 (0) | 0/6 (0) |