TABLE 3.

d_s, d_n, and d_n/d_s ratios^a

Protein gene (no. of isolates analyzed)	Avg pairwise divergence (SD) for:		dn/ds ratio
	ds	dn
N (24)	0.0595 (0.0110)	0.0029 (0.0015)	0.05
F (24)	0.0692 (0.0124)	0.0029 (0.0012)	0.05
G (38)	0.1131 (0.0166)	0.0490 (0.0061)	0.58
Gb (11)	0.0802 (0.0165)	0.0493 (0.0069)	0.48
Gc (32)	0.0718 (0.0145)	0.0446 (0.0066)	0.62

^aThe analysis of the N, F, and G protein genes was performed with 690, 741, and 489 nucleotides, respectively. 

^bAnalysis was performed with virus isolated in the absence of selective pressure due to vaccination. 

^cAnalysis was performed with virus isolated in countries where vaccination was widely used.