Table 3. Analysis of nucleotide and amino acid identity of ORF5 among 32 PRRSV isolates and with represent PRRSV isolates LV, VR-2332, RespPRRSV, Ch-1a, and highly pathogenic strain JX-A1.

Isolation Years(No.)		2007	2008	2009	LV	VR-2332	RespPRRS	JX-A1	Ch-1a
2007(9)	nt	86.9–99.8	86.2∼99.8	86.2∼99.8	61.7∼62.9	87.6∼99.0	87.2∼99.3	88.4∼98.8	91.5∼94.9
	aa	86.5–100.0	85.5∼99.5	86.0∼99.5	55.3∼57.3	88.0∼98.0	87.0∼99.0	86.0∼97.5	90.5∼92.5
2008(13)	nt	-	86.2∼99.8	86.2∼99.8	61.7∼62.9	86.9∼99.0	87.2∼99.3	88.1∼99.3	91.2∼95.4
	aa	-	85.5∼99.5	86.0∼100.0	54.3∼57.8	87.5–98.0	86.5∼99.0	85.5∼99.0	90.0∼93.5
2009(10)	nt	-	-	94.5–99.8	61.9–62.2	86.9∼89.4	87.1∼89.1	93.7∼99.2	92.9∼95.2
	aa	-	-	94.0∼99.5	56.3∼57.3	87.5∼89.0	86.5∼88.0	93.0∼99.0	92.5∼94.5