Mortality rate in critically ill patients with CMV infection was 29 to 100% as compared with 11 to 74% in those without CMV infection. Except for two retrospective studies [9, 18] , no other studies showed a significant difference in the mortality rates between those with and without CMV infection. CMV viremia at any level was associated with death or continued ICU hospitalization at 30 days (OR 5.7, 95% CI 2.1 to 15.6) [11] .