Table 3.

Information of the representative strains. The strain designation, area, isolatedtime, accession No. of representative strains were listed in Table 3

No.	Strain	Area	Time	Accession No
1	EDRD-1	Japan	1992	AB288356
2	Leystad virus	Netherlands	1993	M96262
3	CH-1a	Beijing, China	1996	AY032626
4	BJ-4	Beijing, China	1996	AF331831
5	PL97–1	South Korea	1997	AY585241
6	HB-1(sh)/2002	Hebei, China	2002	AY150312
7	VR-2332	America	2003	AY150564
8	Resp PRRS MLV	America	2005	AF066183
9	SHB	Guangdong, China	2005	EU864232
10	JXA1	Jiangxi, China	2006	EF112445
11	JXwn06	Jiangxi, China	2006	EF641008
12	GD	Guangdong, China	2006	EU825724
13	HuN4	Hunan, China	2007	EF635006
14	CH-1R	Heilongjiang, China	2008	EU807840
15	JXA1-P80	Guangdong, China	2008	FJ548853
16	GDBY1	Guangdong, China	2008	GQ374442
17	NADC30	America	2008	JN654459
18	GD-100	Guangdong, China	2009	GU143913
19	QY2010	Guangdong, China	2010	JQ743666
20	GX1003	Guangxi, China	2010	JX912249
21	GM2	Guangdong, China	2011	JN662424
22	QYYZ	Guangdong, China	2011	JQ308798
23	SD16	Shanxi, China	2012	JX087437
24	JL580	Jilin, China	2013	KR706343
25	CHsx1401	Beijing, China	2015	KP861625