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| Vaccine | Number of chickens/group | MD mortality | MD% | Protection Index (PI) % |
| rHVT-US2-HA | 15 | 4 | 33 | 65.3 |
| rHVT-US10-HA | 15 | 3 | 20 | 78.9 |
| HVT Fc126 | 15 | 3 | 20 | 78.9 |
| Control | 20 | 11 | 95 | 0 |
MD (%) indicates the percentage of MDV-infected chickens that died after challenge with MDV strain vJ-1 or developed gross tumors prior to experimental termination.
