Table 4. Selection sites detected in RSV fusion protein genes.

	Positively selected sites			No. of negatively selected sites			dN/dS
	SLAC	IFEL	FEL	SLAC	IFEL	FEL
RSV isolate	None	None	103 (0.03)*	33	37	70	0.102
RSV-A	None	None	None	9	7	23	0.093
RSV-B	None	125 (0.02)*	None	1	3	9	0.137

^§p-value <0.05 are indicated by*. Selection site detection was performed on the Datamonkey website (http://www.datamonkey.org) with the single likelihood ancestor counting (SLAC), fixed effects likelihood (FEL), and internal fixed effects likelihood (IFEL) methods.