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Preservation of regulatory T cells (Tregs) and Helios+ subset during CD4 lymphopenia and viraemia. The frequencies and numbers of (a) Tregs and (b) Helios+ subset; and (c) Treg/CD4 and (d) Helios+ Treg/CD4 ratios within the poor, intermediate and good HIV status groups. *P < 0·05; **P < 0·001.
