Table 2.

HTLV proviral sequences in lysates of PBMCs from 81 IDUs

Sequences detected	HTLV-I seropositive	HTLV-II seropositive	Indeterminate serotype	HTLV-I/II seronegative
HTLV-I
gag + pol + tax	1	0	0	1
gag or pol + tax	0	0	1	6
HTLV-II
gag + pol + tax	0	8	0	0
gag or pol + tax	0	2	2	3
HTLV-I/II
gag + tax	0	0	0	5
tax	0	1	0	9
PCR negative	0	3	0	39
PCR positive	1/1	11/14	3/3	24/63

HTLV sequences were detected by PCR/Southern blot analysis using the primers and probes listed in Table 1. By standard serology, 63/81 were negative.