Table 1. Prevalence of avian influenza A(H5) and A(H9) viruses in pooled poultry and environmental samples, Chittagong and Dhaka, Bangladesh*.
| Sample type |
No. pools |
A(H5) virus prevalence, % |
|
A(H9) virus prevalence, % | ||
|---|---|---|---|---|---|---|
| Observed pool level |
Estimated bird level (95% HDI)† |
Observed pool level |
Estimated bird level (95% HDI)† |
|||
| Poultry | ||||||
| Retail LBM | ||||||
| Broiler | 96 | 5.2 | 0.9 (0–9.4) | 37.5 | 10.8 (2.3–22.5) | |
| Sonali | 62 | 3.2 | 1.4 (0–13.2) | 32.3 | 6.6 (1.2–14.5) | |
| Desi | 61 | 3.4 | 1.3 (0–12.2) | 29.5 | 6.8 (1.3–14.9) | |
| Waterfowl |
20 |
50.0 |
8.1 (0–46.8) |
|
25.0 |
2.8 (0.3–7.0) |
| Mixed LBM | ||||||
| Broiler | 57 | 1.8 | 0.9 (0–4.0) | 47.4 | 13.1 (1.2–30.1) | |
| Sonali | 60 | 10.0 | 1.4 (0–5.7) | 31.7 | 8.0 (0.4–19.8) | |
| Desi | 66 | 9.1 | 1.3 (0–5.2) | 39.4 | 8.3 (0.5–20.4) | |
| Waterfowl |
55 |
27.3 |
7.6 (0–24.6) |
|
16.4 |
3.4 (0.1–9.7) |
| Environmental site | ||||||
| Retail LBM | ||||||
| Stall area | 101 | 5.9 | 1.5 (0–10.4) | 16.8 | 3.2 (0.1–9.1) | |
| Slaughter area | 99 | 7.1 | 1.4 (0–10.1) | 25.3 | 6.2 (0.2–16.6) | |
| Mixed LBM | ||||||
| Stall area | 102 | 15.7 | 3.1 (0–11.3) | 23.5 | 5.2 (0.1–14.1) | |
| Slaughter area | 98 | 14.3 | 3.0 (0–11.0) | 37.8 | 9.9 (0.4–25.0) | |
*Desi, which means “local” in Bengali, are indigenous chicken breeds raised in backyard farms. Sonali is a cross-breed of the Rhode Island Red cocks and Fayoumi hens. HDI, high-density interval; LBM, live bird market. †Bird and environmental swab specimen–level prevalence in contaminated live bird markets. Median values are reported.