Abstract

On the assumption that the number of E-rosettable lymphocytes (active T lymphocytes) is an index of cell-mediated immunity, rosette assays were performed at early cycle and at midcycle for 6 women taking oral contraceptives (OCs) for 1-4 years. OC subjects at midcycle had 21.4% active rosette-forming lymphocytes as compared with 14.1% in controls (p less than .05). The 2 youngest subjects had higher values during the early cycle. These results imply the possibility of hormonal regulation of human T-cell activity.

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