Table 2. Genetic distances within HIV subtypes and CRFs.

Gene Region	n	Subtype	Distance (%)
			Mean	Range
HIV-1 PR	15	CRF02	1.8	0.3–3.8
	52	CRF06	1.1	0.1–4.1
HIV-1 gp41	25	CRF02	3.5	0.8–7.7
	37	CRF06	2	0.3–6.3
HIV-2 PR	17	A	6.2	0.3–12.8
HIV-2 PR group #1	5	A	0.8	0.3–2.3
HIV-2 PR group #2	6	A	1.1	0.3–3.0

CRF, circulating recombinant forms.