Prevalence and genetic evolution of porcine reproductive and respiratory syndrome virus in commercial fattening pig farms in China

Table 3 Selective pressure analysis of GP5 of L1.8(L1C) PRRSV

Vaccination	Name	Selective pressure analysis
		aBSREL		FEL
		ω	p value	Sites of positive selection	alpha = beta	p value
Vaccined	Heilongjiang B farm	ω1 = 0.224(100%)	1	29	0.892	0.0135
				33	0.749	0.004
				34	1.013	0.002
	Heilongjiang C farm	ω1 = 0.0(100%)	1	91	2.927	0.005
	Heilongjiang C farm	ω1 = 0.431(100%)	1	91	2.927	0.005
No vaccined	Heilongjiang A farm	ω1 = 0.0716 (95%)	0.0002	57	3.334	0.0578
		ω2 = 36.6 (4.9%)	0.0002	57	3.334	0.0578
		ω1 = 0.283 (100%)	1	178	1.193	0.076
		ω1 = 0.308 (100%)	1	178	1.193	0.076
	Xinjiang farm	ω1 = 0.113 (100%)	1	102	1.98	0.069
	Xinjiang farm	ω1 = 0.113 (100%)	1	120	1.764	0.0043
	Hebei farm	ω1 = 0.000112 (91%)	0.149	13	1.633	0.0018
		ω2 = 3.68 (9.0%)
				15	0.607	0.0583
				23	0.873	0.0593
				28	0.76	0.0625
	Henan farm	ω1 = 1.00 (100%)	0	\	\	\

aBSREL, (ω: non-synonymous to synonymous substitutions ratio or dN/dS, class Site classification at (0 > 1 and LRT p value < 0.05; FEL, alpha = beta: the rate estimate under the neutral model, p value: asymptotic p value for evidence of selection, i.e. beta &neq; alpha, class Site classification at p < = 0.1

ISSN: 2055-5660