Table 7.
Cross tabulation of results of the post-POL vaccination serology provided in Table 5 comparing the classification of the sampled flocks H5N1 HPAI sero-protective status using a standardized test antigen (Leg/03) against: A. one of the then commonest circulating strains (Kon/07); and B. the antigen homologous to the vaccine seed strain.
| A. Leg/03 vs. Kon/07 AT TWO THRESHOLDS OF POSITIVITY (n = 15 FARMS) AT TWO THRESHOLDS FOR POSITIVITY | |||||||
| 1. Threshold for positivity: ≥1:16 | Circulating strain (Kon/07) | 2. Threshold for positivity: ≥1:32 | Circulating strain (Kon/07) | ||||
| Leg/03 | NEG | POS | Leg/03 | NEG | POS | ||
| NEG | 1 | 0 | NEG | 1 | 0 | ||
| POS | 0 | 14 | POS | 1 | 13 | ||
| B. A. Leg/03 vs. HOMOLOGOUS TEST ANTIGEN AT TWO THRESHOLDS OF POSITIVITY (n = 9 FARMS) | |||||||
| 1. Threshold for positivity: ≥1:16 | Homologous test antigen | 2. Threshold for positivity: ≥1:32 | Homologous test antigen | ||||
| Leg/03 | NEG | POS | Leg/03 | NEG | POS | ||
| NEG | 1 | 0 | NEG | 1 | 0 | ||
| POS | 0 | 8 | POS | 1 | 7 | ||
Each cross-tabulation comparison uses the two thresholds applied to the HI test, i.e., ≥1:16 and ≥1:32.