Table 2. Description of contact rates of pig farms used for ASF transmission simulation model.

Contact groups (Source-Destination)	Mean contact rate/week (Lee et al., 2019)
	Direct	Indirect	New combined contact rate*
Small farms → Small farms	0.072	0.282	0.241
Medium farms → Medium farms	0.073	0.271	0.236
Large farms → Large farms	-	3.5	0.021

*formula: direct contact rate + indirect contact rate × transmission probability