Cytomegalovirus infection after acute rejection therapy in seropositive kidney transplant recipients

Background Acute rejection (AR) after solid organ transplantation has been known to be a risk factor for cytomegalovirus (CMV) infection. However, data regarding the risk for CMV infection during and after anti-rejection therapy are limited. This study investigated whether the risk of CMV infection and disease within 6months of kidney transplantation (KT) increases in CMV-seropositive KT recipients who develop AR. Methods A total of 992 seropositive KT recipients, including 75 patients (8%) who developed AR within 6months after KT and 917 patients (92%) who did not, were recruited between May 2007 and April 2012. Results No significant difference was found in the incidence of CMV infection between the groups (AR group, 13% [10/75] vs. non-AR group, 10% [92/917], P=0.37). The number of KT recipients in each group receiving preemptive therapy for CMV was similar (5% [4/75] vs. 6% [53/917], 0.99). While the incidence of CMV syndrome was comparable (0% [0/75] vs. 1% [12/917], 0.99), the incidence of tissue-invasive CMV disease (8% [6/75] vs. 3% [27/917], P=0.04), particularly gastrointestinal CMV disease, was significantly greater in patients who experienced AR. No CMV-related mortality occurred in either group. AR (odds ratio, 2.81; 95% confidence interval, 1.08-7.29; P=0.03) was an independent risk factor for tissue-invasive CMV disease within 6months of KT. Conclusions A high index of suspicion and active evaluation for tissue-invasive CMV disease in KT recipients suffering AR may be necessary to ensure appropriate treatment.