Epidemiology and Clinical Features of Epstein-Barr Virus and Cytomegalovirus Infections in Japanese Infants and Young Children

Area of Science:

• Pediatrics
• Virology
• Epidemiology

Background:

• Clinical features of Epstein-Barr virus (EBV) and cytomegalovirus (CMV) in young children in developed nations are not well-defined.
• Understanding current seroepidemiology and clinical presentations is crucial for pediatric infectious disease management.

Purpose of the Study:

• To investigate the clinical features and seroepidemiology of EBV and CMV infections in young children in Japan.
• To compare clinical manifestations between primary EBV infection and EBV reactivation.

Main Methods:

• Seroprevalence analysis of 303 serum samples using Enzyme Immunosorbent Assay (EIA).
• Investigation of viral infections in a cohort of 2,732 febrile children under five years old.
• Detection of EBV and CMV DNA in serum samples.

Main Results:

• EBV and CMV seroprevalence reached 42.9% and 57.1% by adolescence, respectively.
• EBV and CMV DNA were detected in 1.76% and 1.24% of febrile children.
• Among primary EBV infections, 60% developed infectious mononucleosis (IM), with higher viral load and specific clinical markers compared to reactivation.

Conclusions:

• Primary EBV infection in young Japanese children frequently leads to IM, with an apparent earlier age of infection compared to previous Western studies.
• CMV infections did not present as IM in this cohort.
• Early detection and understanding of EBV/CMV clinical features are important for pediatric care.