Identifying CD4 T-cell counts associated with reduced TREC contents within CD4 T cells. CD4 TREC contents were compared in 3 groups of HIV-1-infected subjects (▦) with CD4 T-cell counts from 400 to 200, 300 to 200, and 200 to 100 cells and of HIV-negative subjects (□). Asterisk indicates statistical significance (P < .05). Data expressed as mean ± SE.