Table 1.

Acronyms and definitions for the different types of pigs used in the economic model. It is important to note that a proportion of H-S pigs are also infected by PCV2. However, these pigs were assumed to not have any economic impact for the farmer. Therefore, the acronym ‘PCV2SI’ in this study only refers to the combination of Sub-D and Sub-S.

Type of pigs in the model	Definition	Group classification
PMWS-D	PCV2 infected pig that develops PMWS clinical signs causing death or the necessity of being culled	PMWS pigs
PMWS-R	PCV2 infected pig that develops PMWS clinical signs, but is able to recover, resulting in delayed slaughter (t3 − t1).
Sub-D	PCV2 infected pig, that shows no clinical PMWS, but that has a reduced growth rate and increased susceptibility for co-infection with other pathogens, leading to death.	Subclinical pigs (PCV2SI)
Sub-S	PCV2 infected pig that shows no clinical PMWS, but has a reduced growth rate and reduced feed intake. This pig will take longer (t2 − t1) to reach the required weight at slaughter.
H-S	Pig, infected or not infected by PCV2, that remains healthy throughout its life, with normal growth and reaches age to slaughter at t1.	Healthy pig sold
NonPCV2-D	These pigs can either be non infected by PCV2 or infected by PCV2 but with no PMWS clinical signs. The death of these pigs is not due to PCV2 infection.	Pig that dies due to non-PCV2 related causes