Human Cytomegalovirus (HCMV): Pathogenesis, Clinical Features, Diagnostic Methods, and Therapeutic Challenges

Abstract

Background: Human cytomegalovirus (HCMV), a member of the Betaherpesvirinae subfamily, is a widespread pathogen that poses a major health concern, particularly in newborns and immunocompromised individuals. The virus possesses a linear double-stranded DNA genome of approximately 230 kb enclosed within an icosahedral nucleocapsid surrounded by a lipid envelope. Results: Expression of the viral genome is regulated through complex transcriptional events leading to the production of immediate-early and late proteins, which play essential roles in viral replication and latency. HCMV can infect various epithelial tissues, including the gastrointestinal, respiratory, and reproductive tracts. The infection often establishes latency in host cells, and complete viral clearance is rarely achieved. Reactivation may occur under conditions of immune suppression, posing a serious threat during organ transplantation, pregnancy, and breastfeeding. Diagnosis is by virological, molecular, and serological tests for viral DNA or specific antibodies. Although various antivirals are available, the treatment is still troublesome owing to drug resistance and low bioavailability, as well as toxicities over long-term administration. These restrictions highlight the importance of developing new therapeutic interventions against viral replication and latency pathways.

Conclusion: HCMV remains an important clinical and public health concern owing to its potential for persistence and reactivation in the host. Advances in molecular diagnostics have improved detection accuracy, but effective management still depends on early diagnosis, immune monitoring, and the development of safer and more potent antiviral therapies. Further research is essential to understand viral latency and to design innovative treatment approaches.