Table 1.

Histopathological findings in the challenged pigs

DPC*	Type	Pathological findings†
		Lung	Inguinal Lymph Nodes	Heart
14	I	Moderate focal/multifocal bronchointerstitial pneumonia (3/3)	Lymphadenopathy (3/3)	Mild multifocal perivascular lymphohistiocytic myocarditis (1/3)
	II	Moderate diffuse/multifocal bronchointerstitial pneumonia (2/3)	Lymphadenopathy (3/3)	Mild multifocal perivascular lymphohistiocytic myocarditis. (3/3)
	Control	No lesions (2/2)	No lesions (2/2)	No lesions (2/2)
21	I	Moderate diffuse interstitial pneumonia (2/2), moderate peribronchiolar and perivascular lymphohistiocytic cuffing (2/2)	Lymphadenopathy (2/2)	Mild multifocal perivascular lymphohistiocytic myocarditis (1/2)
	II	Mild to moderate diffuse interstitial pneumonia (2/2), severe peribronchiolar and perivascular lymphohistiocytic cuffing (1/2)	Lymphadenopathy (2/2)	Very mild multifocal perivascular lymphohistiocytic myocarditis (1/2)
	Control	No lesions (1/1)	No lesions (1/1)	No lesions (1/1)

* days post challenge

† No lesions were observed in liver, spleen, kidney and ileum.