High Cytomegalovirus Viral Load Is Associated With 182-Day All-Cause Mortality in Hospitalized People With Human Immunodeficiency Virus

Background. Cytomegalovirus (CMV) infection is associated with increased mortality in persons with HIV (PWH). It is less clear whether CMV infection is still associated with mortality when routinely screened and adequately treated. Methods. This retrospective cohort study recruited 1003 hospitalized adults with HIV with CD4 cell counts <200 cells/mu L from May 2017 to June 2021. Blood CMV DNA was routinely measured and CMV DNAemia was treated if end-organ disease occurred. CMV viral load was categorized into below the limit of quantification (BLQ; <500 IU/mL), low viral load (LVL; 500-10 000 IU/mL), and high viral load (HVL; >= 10 000 IU/mL) groups. We compared the 182-day all-cause mortality among different groups. Results. The median (IQR) CD4 cell count of patients was 33 (13-84) cells/mu L. The prevalence of CMV DNAemia was 39.8% (95% CI: 36.7-42.9%) and was significantly associated with CD4 cell count. The 182-day all-cause mortality was 9.9% (95% CI: 8.0-11.7%). Univariable analysis showed that, compared with BLQ, LVL and HVL were associated with 1.73-fold and 3.81-fold increased risks of mortality, respectively (P=.032 and P<.001). After adjustment for predefined confounding factors, HVL but not LVL was still associated with increased risk of mortality (adjusted hazard ratio: 2.63; 95% CI: 1.61-4.29; P<.001). However, for patients on effective antiretroviral therapy, the impact of HVL on 182-day mortality was not significant (P=.713). Conclusions. High CMV viral load in hospitalized PWH was associated with higher mortality, even when identified early by screening. Optimalization of the management for those patients needs to be explored in future studies.