CD28 and Sepsis: The lymphocyte count, T lymphocyte count, CD4+ T cell count, CD4+CD28+ T cell count and CD8+CD28+ T cell count were all significantly lower in the non-survived sepsis group (454 versus 731/uL, P=0.013; 283 versus 597/uL, P=0.009; 152 versus 394/uL, P=0.005; 146 versus 353/uL, P=0.006; and 29 versus 81/uL, P=0.007 respectively).