Table 1.
The percentages of chickens and ducks with titres ⩾24 against H5 and Newcastle disease (ND) following each round of mass vaccination
| Treatment | Round | No. sampled | Percent with HPAI titre ⩾24 (95% CI) | Percent with ND titre ⩾24 (95% CI) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Chicken | Duck | Chicken | Duck | Overall | Chicken | Duck | Overall | ||
| Control | 1 | 1 753* | 161 | 2·9 (2·2–3·8) | 4·3 (1·7–8·6) | 3 (2·3–3·9) | 10·5 (9·1–12) | 11 (6·6–16·8) | 10·5 (9·2–12) |
| 2 | 1 903 | 69 | 2 (1·5–2·8) | 0 (0–5·2) | 2 (1·4–2·7) | 13·4 (11·9–15) | 7·2 (2·4–16·1) | 13·2 (11·7–14·7) | |
| 3 | 2 096 | 110 | 1·3 (0·9–1·9) | 1·8 (0·2–6·4) | 1·4 (0·9–1·9) | 5·3 (4·4–6·3) | 0·1 (0·0–5·0) | 5·1 (4·2–6·1) | |
| 4 | 2 043 | 304 | 3·0 (2·3–3·9) | 0·3 (0·01–1·8) | 2·7 (2·1–3·4) | 9·9 (8·6–11·2) | 1·3 (0·3–3·3) | 8·7 (7·7–10·0) | |
| Overall | 7 795† | 644 | 2·2 (1·9–2·6) | 1·2 (0·5–2·4) | 2·1 (1·8–2·5) | 9·5 (8·9–10·2) | 4·0 (2·7–5·9) | 9·1 (8·5–9·7) | |
| AI vaccination | 1 | 2 026 | 164 | 28·1 (26·1–30·1) | 13·3 (8·5–19·5) | 27 (25·1–28·9) | 8·5 (7·3–9·8) | 7·3 (3·8–12·4) | 8·4 (7·3–9·6) |
| 2 | 2 169 | 139 | 31·4 (29·5–33·4) | 14·4 (9–21·3) | 30·4 (28·5–32·3) | 7·2 (6·2–8·4) | 7·9 (4–13·7) | 7·3 (6·2–8·4) | |
| 3 | 2 323 | 35 | 44·9 (42·8–46·9) | 22·9 (10·4–40·1) | 44·5 (42·5–46·6) | 6·5 (5·5–7·6) | 11·4 (3·2–26·7) | 6·6 (5·6–7·6) | |
| 4 | 2 364 | 7 | 30·2 (28·4–32·1) | 28·6 (3·7–71·0) | 30·2 (28·4–32·1) | 7·7 (6·7–8·9) | 0·0 (0·0–41·0) | 7·7 (6·7–8·8) | |
| Overall | 8 882 | 345 | 33·8 (32·8–34·8) | 15·1 (11·5–19·3) | 33·1 (32·2–34·1) | 7·4 (6·9–8·0) | 7·8 (5·2–11·2) | 7·4 (6·9–8·0) | |
| AI and ND vaccination | 1 | 1 998‡ | 301 | 26·2 (24·3–28·2) | 22·9 (18·3–28·1) | 25·8 (24–27·6) | 12·7 (11·2–14·2) | 8·6 (5·7–12·4) | 12·1 (10·8–13·5) |
| 2 | 2 011 | 221 | 25·6 (23·7–27·6) | 36·9 (30·6–43·7) | 26·7 (24·9–28·6) | 18·3 (16·6–20) | 12·6 (8·5–17·7) | 17·7 (16·1–19·3) | |
| 3 | 2 204 | 150 | 36·9 (34·9–39·0) | 32·0 (24·6–40·1) | 36·6 (34·7–38·6) | 26·0 (24·1–27·8) | 12·0 (7·3–18·3) | 25·1 (23·3–26·9) | |
| 4 | 2 233 | 109 | 21·0 (19·3–22·8) | 4·6 (1·5–10·4) | 20·2 (18·6–21·9) | 19·9 (18·2–21·6) | 2·7 (0·6–7·8) | 19·1 (17·5–20·7) | |
| Overall | 8 846§ | 781 | 27·4 (26·5–28·4) | 26 (22·9–29·2) | 27·3 (26·4–28·2) | 19·3 (18·5–20·2) | 9·5 (7·5–11·7) | 18·5 (17·7–19·3) | |
AI, Avian influenza; CI, Confidence interval.
*
Samples for ND = 1747.
†
Samples for ND = 7789.
‡
Samples for ND = 1997.
§
Samples for ND = 8845.