Table 1. Avian influenza viruses isolated in Vinh Long province in Vietnam in 2019.
| Model | Species | No. of samples | AIV positive | Prevalence (95% CI) | Subtype (no. of isolates) |
|---|---|---|---|---|---|
| Backyard | Chicken | 220 | 17 | 3.9 (2.3‒6.1) | H5N1 (7), H9N2 (10) |
| Duck | 189 | 1 | H10N3 (1) | ||
| Muscovy duck | 50 | 0 | |||
| Biosecurity | Chicken | 330 | 0 | 0.0 | |
| Duck | 140 | 0 | |||
| Muscovy duck | 30 | 0 | |||
| LBM | Chicken | 212 | 16 | 10.7 (7.9‒14.1) | H9N2 (16) |
| Duck | 140 | 28 | H5N1 (2), H5N6 (20), H6N6 (4), H9N2 (2) | ||
| Muscovy duck | 68 | 1 | H10N3 (1) | ||
| PDS | Chicken | 106 | 14 | 18.0 (23.5‒23.3) | H9N2 (14) |
| Duck | 117 | 32 | H5N1 (3), H5N6 (2), H6N6 (27) | ||
| Muscovy duck | 32 | 0 | |||
| Total | 1,634 | 109 | 6.7 (5.5‒8.0) | ||
AIV: avian influenza virus, CI: confidence interval, LBM: live bird market, PDS: poultry delivery station. High pathogenicity avian influenza viruses are highlighted in bold.