Table 3. Contact rates between production types and probabilities of infection transfer.

Sources and recipients	Disease spread	Contact rate	Probability of infection given contact
type 1 → type 1	Direct contact, indirect contact	1.2	0.25
type 1 → type 2	Indirect contact	0.5	0.4
type 1 → type 3	Direct contact, indirect contact	1.2	0.25
type 1 → type 4	Indirect contact	0.2	0.3
type 2 → type 1	Indirect contact	0.5	0.25
type 2 → type 2	Indirect contact	0.9	0.4
type 2 → type 3	Indirect contact	0.2	0.25
type 2 → type 4	Indirect contact	0.45	0.3
type 3 → type 1	Direct contact, indirect contact	1.2	0.25
type 3 → type 2	Indirect contact	0.4	0.3
type 3 → type 3	Direct contact, indirect contact	1.2	0.25
type 3 → type 4	Indirect contact	0.6	0.4
type 4 → type 1	Indirect contact	0.2	0.25
type 4 → type 2	Indirect contact	0.26	0.3
type 4 → type 3	Indirect contact	0.26	0.25
type 4 → type 4	Indirect contact	0.4	0.4