TABLE 1.

Macroscopic and microscopic lung lesion scores of infected and contact pigs

Lesion size	Virus	Lung lesion scorea
		Infected pigs			Contact pigs (5 days p.c.)
		3 days p.i.	5 days p.i.	7 days p.i.
Macroscopic	KS-83533N	13.71 ± 4.95	6.00 ± 1.55	4.71 ± 1.13	3.00 ± 0.61
	KS-91088	10.68 ± 2.75	4.54 ± 1.97	2.43 ± 0.72	4.18 ± 0.87
	KS-110529	11.71 ± 0.61	9.71 ± 0.87	5.86 ± 0.35	7.68 ± 2.73
	KS-107824	15.93 ± 7.66	5.89 ± 1.19	4.11 ± 1.15	1.32 ± 1.96
	Control	0.00	0.00	0.00	NA
Microscopic	KS-83533N	2.50 ± 0.20	2.38 ± 0.24	1.75 ± 0.14	1.50 ± 0.20b
	KS-91088	1.88 ± 0.13	1.88 ± 0.31	1.75 ± 0.32	1.38 ± 0.24c
	KS-110529	2.25 ± 0.25	2.27 ± 0.24	2.50 ± 0.20	2.38 ± 0.24d
	KS-107824	1.75 ± 0.48	2.13 ± 0.38	1.50 ± 0.20	0.75 ± 0.14b,c,d
	Control	0.00	0.00	0.00	NA

^aThe macroscopic lung lesion scores were determined as percentages of the lung. The microscopic lung lesion scores were determined by the following criteria: 0, no lesion; 1, mild; 2, moderate; 3; severe. The data are means ± standard errors of the mean (SEM). NA, not applicable; there were no control pigs in the contact group.

^bSignificant differences were observed between the 2 groups (P < 0.05).

^cSignificant differences were observed between the 2 groups (P < 0.05).

^dSignificant differences were observed between the 2 groups (P < 0.001).