Volume 12, Number 2—February 2006
Research
Free-grazing Ducks and Highly Pathogenic Avian Influenza, Thailand
Marius Gilbert*
, Prasit Chaitaweesub†, Tippawon Parakamawongsa†, Sith Premashthira†, Thanawat Tiensin†‡, Wantanee Kalpravidh§, Hans Wagner§, and Jan Slingenbergh§¶
, Prasit Chaitaweesub†, Tippawon Parakamawongsa†, Sith Premashthira†, Thanawat Tiensin†‡, Wantanee Kalpravidh§, Hans Wagner§, and Jan Slingenbergh§¶
Table 1
Variables used in the analysis of highly pathogenic avian influenza distribution in Thailand (subdistrict level) and Suphanburi Province (village level)
| Category | Description | Abbreviation |
|---|---|---|
| Poultry* | No. broilers and layer hens | BrLaCh |
| No. native chickens | NaCh | |
| No. meat and layer ducks | MeLaDu | |
| No. free-grazing ducks | FgDu | |
| No. cocks | Co | |
| No. other poultry | Ot | |
| Land use/water† | Proportion of land occupied by wetland in the subdistrict, and in a 1-, 2-, 5-, and 10-km radius neighborhood | Pwet, Pwet1K, Pwet2K, Pwet5K, Pwet10K |
| Proportion of land occupied by rice fields in the subdistrict, and in a 1-, 2-, 5-, and 10- km radius neighborhood | Price, Price1K, Price2K, Price5K, Price10K | |
| River/stream density (per km2) in the subdistrict and in a 1-, 2-, 5-, and 10-km radius neighborhood | Sd, Sd1K, Sd2K, Sd5K, Sd10K | |
| People/roads‡ | No. humans | Hpop |
| No. roads | Nroads | |
| Topographic§ | Elevation, m | Alt |
| Slope, degrees | Slp |
*Census in the subdistrict or village.
†Estimate in the subdistrict was not used for the village-level analysis; distance-based variables between the 1- and 10-km neighborhood were estimated around the village point or subdistrict centroid.
‡No. roads in the subdistrict or connected to the village.
§These variables were averaged in the subdistrict polygon for subdistrict level analysis or extracted at the point of the village for village-level analysis.
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