Comparison of the number of CD8⁺ T cells per 10 hpf's in intestinal biopsies. Paraffin-embedded colon biopsies of healthy controls (n = 13), and patients after allogeneic transplantation with GvHD (n = 62; chronic GvHD, n = 18; acute GvHD, n = 44), CMV-colitis (n = 6), and diverticulitis (n = 6) were stained for CD8 by immunohistochemistry. The number of CD8⁺ cells was counted per 10 high-power fields. Results are expressed as mean ± SEM. The differences of CD8⁺ T cells in GvHD, CMV, and diverticulitis were not statistically significant.