Table 1.

Summary of env and pol sequences generated from each participant^a

Participant	Total no. of sequences	env sequence				pol (RT) sequence
		No.	%			No.	%
			Pre-ART	Sputum	Concordant		Pre-ART	Sputum	Concordant
B1	324	182	9	33	41	142	8	35	61
B2	179	100	11	41	49	79	22	38	97
F1	269	120	10	29	64	149	15	35	60
L1	295	104	7	26	44	191	13	21	51
R1	400	210	10	34	37	190	12	33	56
V1	189	114	11	43	61	75	17	43	93
Median	282	117	10	32	47	145.5	14	34	61
Total	1,656	830				826

^aConcordant sequences are defined by amplification of both env and pol in the same first-round PCR. Because the region of env sequenced is longer and more variable than the RT sequence, more env sequencing reactions failed, resulting in a greater percentage of concordant RT sequences.