Table 4.

Estimates of average evolutionary divergence over sequence pairs within groups arranged by sample collection date

Genomic region	Genetic distance within subgroups
	2006	2007	2008	2009	2010
IR	0.007±0.004	0.003±0.002	0.009±0.002	0.018±0.004	0.017±0.004
V1	0.003±0.002	0.001±0.001	0.002±0.001	0.005±0.002	0.004±0.001
V2	0.002±0.002	0.001±0.000	0.002±0.001	0.004±0.002	0.005±0.002
C1	0.004±0.001	0.001±0.000	0.002±0.000	0.004±0.001	0.004±0.001
C2	0.008±0.003	0.003±0.002	0.004±0.001	0.005±0.002	0.007±0.003
C3	0.006±0.003	0.001±0.001	0.003±0.001	0.006±0.002	0.009±0.003
C4	0.003±0.002	0.002±0.001	0.003±0.001	0.004±0.002	0.004±0.002