Table 1. Mortality, morbidity and protection rates of different vaccinated groups challenged with GX-YL5, GX-GL11079 and GX-NN09032 strains of IBV.
| Groupsa) (serotype) | Challenge strainsb) (serotype) | Mortalityc) (%) | Morbidityd) (%) | Protection ratese) (%) |
|---|---|---|---|---|
| H120 (serotype 3) | GX-YL5 (serotype 1) | 41.7 (5/12) | 58.3 (7/12) | 41.7 |
| GX-GL11079 (serotype 2) | 16.7 (2/12) | 41.7 (5/12) | 58.3 | |
| GX-NN09032 (serotype 5) | 0 (0/12) | 41.7 (5/12) | 58.3 | |
| 4/91 (serotype 5) | GX-YL5 (serotype 1) | 0 (0/12) | 16.7 (2/12) | 83.7 |
| GX-GL11079 (serotype 2) | 0 (0/12) | 25.0 (3/12) | 75.0 | |
| GX-NN09032 (serotype 5) | 0 (0/12) | 16.7 (2/12) | 83.7 | |
| LDT3-A (unknown) | GX-YL5 (serotype 1) | 8.3 (1/12) | 33.3 (4/12) | 66.7 |
| GX-GL11079 (serotype 2) | 0 (0/12) | 25.0 (3/12) | 75.0 | |
| GX-NN09032 (serotype 5) | 0 (0/12) | 25.0 (3/12) | 75.0 | |
| Non-vaccinated | GX-YL5 (serotype 1) | 58.3 (7/12) | 100 (12/12) | 0 |
| GX-GL11079 (serotype 2) | 25.0 (3/12) | 100 (12/12) | 0 | |
| GX-NN09032 (serotype 5) | 0 (0/12) | 100 (12/12) | 0 | |
| Blank control | - | 0 (0/12) | 0 (0/12) | - |
a) Vaccination at 7 days of age. b) Challenge at 21 dpi. c) Mortality was determined by dividing the number of dead chickens by the total number of chickens. d) Morbidity was determined by dividing the number of affected chickens by the total number of chickens. e) Protection rate was determined by dividing the number of unaffected chickens by the total number of chickens.