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Objective To investigate the relationship between CMV infection and renal allograft rejection. Methods 39 kidney biopsies and transplant nephrectomies were collected and investigated for CMV immediate early antigen by immunohistochemistry. Results In 14 out of 39 tissue specimens CMV immediate early antigen were found. 8 biopsies from normal donor kidneys were negative; only 1 (10%) in 10 tissue specimens with early stage acute rejection was positive; 5(55.6%) in 9 biopsies with late stage acute rejection and 8 (66.7%) in 12 tissue blocks with chronic rejection were positive. Compared with normal kidney tissues, the infections in tissues with early stage acute rejection didnt increase obviously, but increased obviously in kidney tissue specimens with late stage rejection and with chronic rejection (P