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Background Cytomegalovirus (CMV) infection is one of the leading causes of morbidity and mortality in kidney transplant (KT) recipients. We investigated the association of CMV serostatus and allograft outcome within the first year after KT. Methods All KT recipients from 2007 to 2017 were derived from the Thai Transplant Registry. The prevalence of allograft loss and mortality within the first year after KT was estimated by Kaplan–Meier analysis. CMV serostatus of the donor (D) and the recipient (R) was assessed as a prognostic factor of allograft loss and mortality by Cox proportional hazards models. Results During a 10-year study period, the population consisted of 4,556 KT recipients with a mean ± SD age of 43 ± 14 years and 63% were male. Fifty-two percent underwent deceased donor KT and 58% received induction therapy. Among 3,907 evaluable patients, the CMV seroprevalence were D+/R+ (88.9%), D+/R− (6.1%), D−/R+ (2.9%), and D−/R− (1.9%). The estimated prevalence of allograft loss and mortality within the first year were 3.8 and 2.8%, respectively. In univariate analysis, CMV D+/R- was significantly associated with mortality within the first year after KT [hazard ratio (HR), 2.10; 95% confidence interval [CI], 1.18–3.75 (P = 0.01)] however not with an allograft loss [HR, 1.51; 95% CI, 0.85–2.66 (P = 0.16)]. In multivariate analysis, CMV D+/R- serostatus was associated with mortality within the first year after KT [HR, 2.04; 95% CI, 1.05–3.95 (P = 0.04)]. Other independent prognostic factors for mortality were older recipient age, deceased donor KT, and hemodialysis after KT (Table 1). Conclusion In the setting where the donor and recipient CMV seropositivity is predominant, CMV seromismatch still negatively affects patient survival within the first year after KT. Disclosures All authors: No reported disclosures.

open forum infectious diseases

1743. Impact of Cytomegalovirus Serostatus on Allograft Loss and Mortality within the First Year after Kidney Transplantation: An Analysis of the National Transplant Registry