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Reisolation of virus in vaccinated and unvaccinated control groups 5 days after challenge
| Group | Chicken embryo passage | ||
|---|---|---|---|
| 1 | 2 | 3 | |
| Vaccinated with 793/B | 0/10 * | 1/10 | 1/10 |
| Unvaccinated control | 5/10 | 9/10 | 9/10 |
Number of affected embryos/total number of embryos
