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Tracheal ciliostasis.
| Group | Vaccination | Vaccine dosage | Challenge strain | Protectiona |
|---|---|---|---|---|
| 1 | ZYYR-2014 | 103.5EID50 | HSJ-2016 | 18/20 |
| 2 | ZYYR-2014 | 103.5EID50 | M41 | 17/20 |
| 3 | YX10-D90 | 103.5EID50 | HSJ-2016 | 16/20 |
| 4 | YX10-D90 | 103.5EID50 | M41 | 17/20 |
| 5 | None | 0 | HSJ-2016 | 0/20 |
| 6 | None | 0 | M41 | 0/20 |
| 7 | None | 0 | none | 10/10 |
A chicken was considered protected if more than eight out of nine rings/bird showed >50% ciliary activity.
