CD4 and infection: When stratified by menopausal status, mean CD4+ T cell infection frequency was significantly greater in the EM of post-menopausal women (6.7%) relative to pre-menopausal women (2.3%; Figure 2C), with pre-menopausal EM infection frequencies consistent with those observed for the CX and ECX for both pre- and post-menopausal donors (Figure 2B).