Table 6.

Mean genetic distances between and within groups using the isolates from Florida in 2005 and New York from 2001 to 2003 as separate subgroups.

	Mean genetic distance* ± SE
	Envelope		NS3/4A
Type of comparison	NT	AA	NT	AA
Within New York (01–03)	0.0024 ± 0.0007	0.0031 ± 0.0015	0.0035 ± 0.0007	0.0011 ± 0.0006
Within Florida 2005	0.0086 ± 0.0015	0.0101 ± 0.0027	0.0064 ± 0.0012	0.0044 ± 0.0016
Within all other regions and times	0.0035 ± 0.0007	0.0033 ± 0.0014	0.0041 ± 0.0007	0.0017 ± 0.0007
Between New York (01–03) and Florida 2005	0.0062 ± 0.0010	0.0073 ± 0.0019	0.0059 ± 0.0009	0.0029 ± 0.0009
Between New York (01–03) and all other regions and times	0.0030 ± 0.0005	0.0032 ± 0.0013	0.0039 ± 0.0006	0.0014 ± 0.0005
Between Florida 2005 and all other regions and times	0.0067 ± 0.0011	0.0072 ± 0.0018	0.0062 ± 0.0010	0.0032 ± 0.0009

* = NT, nucleotide; AA, amino acid.