Table 3. Mean titer value of each flock in the ELISA test and HI test and percentage of animals with a protective titer per flock*.
| Flock No. | Days since last vaccination | ELISA test | HI test | Average age of the tested chickens in months | Percentage of animals per flock with protective titer** (ELISA/HI) |
|---|---|---|---|---|---|
| 1 | 70 | 11.00 | 4.33 | 6.6 | 90.0 (90.0/85.2) |
| 2 | 76 | 1.06 | 0.10 | 5.8 | 10.0 (10.0/0.0) |
| 3 | 69 | 11.27 | 6.13 | 20.6 | 100.0 (100.0/96.6) |
| 4 | 111 | 7.96 | 2.80 | 5.0 | 70.0 (70.0/43.3) |
| 5 | 69 | 11.27 | 5.07 | 9.4 | 93.3 (93.3/73.3) |
| 6 | 87 | 12.24 | 5.10 | 6.2 | 100.0 (100.0/90.0) |
| 7 | 74 | 9.19 | 3.48 (29/30) | 6.2 | 76.7 (76.7/58.6) |
| 8 | 81 | 13.51 | 7.73 | 16.2 | 100.0 (100.0/100.0) |
| 9 | 74 | 11.19 | 4.33 (27/30) | 7.4 | 100.0 (93.3/88.9) |
| 10 | 75 | 10.99 | 4.73 | 5.0 | 93.3 (93.3/83.3) |
| 11 | 90 | 12.39 | 5.82 (28/30) | 13.4 | 100.0 (100.0/93.1) |
| 12 | 79 | 8.15 | 3.52 (29/30) | 13.4 | 66.6 (66.6/51.7) |
| 13 | 72 | 9.55 | 3.69 | 9.0 | 80.0 (80.0/56.7) |
| 14 | 72 | 12.36 | 5.37 | 13.0 | 97.0 (97.0/80.0) |
| 15 | 72 | 7.57 | 2.73 | 7.8 | 63.3 (63.3/46.7) |
| 16 | 87 | 12.35 | 5.68 (28/30) | 10.6 | 100.0 (100.0/92.9) |
| 17 | 87 | 9.50 | 3.47 | 5.0 | 86.6 (83.3/63.3) |
| 18 | 89 | 12.86 | 5.39 (28/30) | 21.0 | 100.0 (100.0/92.9) |
| 19 | 89 | 13.76 | 7.36 (28/30) | 30.2 | 100.0 (100.0/96.4) |
| 20 | 89 | 11.36 | 4.24 (29/30) | 14.6 | 93.3 (93.3/69.0) |
| 21 | 89 | 12.06 | 5.64 (28/30) | 10.6 | 93.3 (93.3/89.3) |
| 22 | 89 | 11.61 | 5.10 | 7.8 | 93.3 (93.3/83.3) |
| 23 | 89 | 11.58 | 4.73 | 6.6 | 96.7 (96.7/80.0) |
| 24 | 89 | 12.71 | 5.87 | 28.6 | 100.0 (100.0/93.3) |
| 25 | 89 | 8.78 | 4.37 | 13.0 | 73.3 (73.3/63.3) |
| 26 | 96 | 12.94 | 7.80 | 31.4 | 100.0 (100.0/100.0) |
| 27 | 90 | 12.22 (28/30) | 6.17 (28/30) | 53.4 | 100.0 (100.0/100.0) |
| total | 83 | 10.86 | 4.84 | 14.0 | 88.0 (87.7/76.7) |
* (x/x) = number of samples analyzed.
** = chickens that had protective titers in one of both tests regarded as protected.