Table 4.

Types of risk-contacts from infected farms (IFs); the number of connections from IF to IF is also reported indicating the proportion of potentially effective contacts.

Type of contacts	Total number	IF to IF contacts [%]
Feed Lorries	314	9	[2.87%]
Owner/relatives	66	6	[9.09%]
Neighbourhood spread (1)	16	16	[100%]
Poultry company technician	18	0	—
Poultry company veterinarian	8	0	—
Proximity to roads	10	2	[20.00%]
Other tracked contacts	13	0	—
Untracked contacts (genomic evidence) (2)	37	37	[100]%
Total	482	70	[14.52%]

(1) Potential Neighbourhood spread was assessed only accounting the presence of other cases within 1500 meters from an Infected Farm (IF) in its outbound risk period (ORP).

(2) As genomic similarities were assumed as likely proxy for untracked contacts, this information was available only for Ifs.