Table S1: Sequences used for analyses
Sequence	Full Sequence Name	Accession number	Cohort^a	Date of Isolation (yr)	Country	Reference
A1Q23 17	A1.KE.94.Q23_17	AF004885		1994	Kenya	Neilson et al., 1999, (19)
A294CY017	A2.CY.94.94CY017_41	AF286237		1994	Cyprus	Gao et al., 2001, (8)
BHXB2	B.FR.83.HXB2	K03455		1983	France	Ratner et al., 1985, (26)
DELI	D.CD.83.ELI	K03454		1983	Dem. Rep. of Congo	Alizon et al., 1986, (1)
F193BR020	F1.BR.93.93BR020_1	AF005494		1993	Brazil	Gao et al., 1998, (7)
F2MP257	F2.CM.95.MP257	AJ249237		1995	Cameroon	Triques et al., 2000, (32)
GDRCBL	G.BE.96.DRCBL	AF084936		1996	Belgium	Oelrichs et al., 1999, (22)
HVI991	H.BE.93.VI991	AF190127		1993	Belgium	Janssens et al., 2000, (13)
JSE7022	J.SE.94.SE7022	AF082395		1994	Sweden	Laukkanen et al., 1999, (15)
KEQTB11C	K.CD.97.EQTB11C	AJ249235		1997	Dem. Rep. of Congo	Triques et al., 2000, (32)
00BW07621	C.BW.00.00BW07621	AF443088		2000	Botswana	Novitsky et al., 2002, (20)
00BW076820	C.BW.00.00BW076820	AF443089		2000	Botswana	Novitsky et al., 2002, (20)
00BW087421	C.BW.00.00BW087421	AF443090		2000	Botswana	Novitsky et al., 2002, (20)
00BW147127	C.BW.00.00BW147127	AF443091		2000	Botswana	Novitsky et al., 2002, (20)
00BW16162	C.BW.00.00BW16162	AF443092		2000	Botswana	Novitsky et al., 2002,