Table 1. Experimental set up and group names.

Housing	Groups before infections	Groups after infections	Number of pigs	Infection	Number of pens
Barren	BH	BHI	14	PRRSV / App	2
Barren	BH	BHC	7	Mock infected (Control)	1
Barren	BH	BHC	7	No infection (Control)	1
Enriched	EH	EHI	14	PRRSV / App	2
Enriched	EH	EHC	7	Mock infected (Control)	1
Enriched	EH	EHC	7	No infection (Control)	1

App: A. pleuropneumoniae

BH: Barren Housed, BHI: Barren Housed Infected, BHC: Barren Housed Control

EH: Enriched Housed, EHI: Enriched Housed Infected, EHC: Enriched Housed Control