Table 1. Data source of the study for variables used to the estimate highly pathogenic avian influenza infection at municipal level, South Korea

Variable	Source	Variable examined
Poultry HPAI	Epidemiological Investigation Report, APQA	The average number of HPAI on farm at municipal level.
Poultry LPAI	KAHIS, APQA	The average number of LPAI on farm at municipal level.
Wild bird HPAI	Epidemiological Investigation Report, APQA	The average number of HPAI on wildbird in lower level local government.
River density	KOSIS, Statistics Korea	The average density of river area at municipal level.
Agricultural land density	KOSIS, Statistics Korea	The average density of crop area at municipal level.
Poultry density	KAHIS, APQA and KOSIS	The population density of at municipal level.
Chicken density	KAHIS, APQA and KOSIS	The population density of chicken at municipal level.
Duck density	KAHIS, APQA and KOSIS	The population density of duck at municipal level.
Livestock vehicle	KAHIS and APQA	The number of livestock related vehicles at municipal level.