Clinical features of Epstein-Barr virus-associated infectious mononucleosis in hospitalized Korean children
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Updated: May 26, 2026

Separation of Immune Cell Subpopulations in Peripheral Blood Samples from Children with Infectious Mononucleosis
Published on: September 7, 2022
Keun Hyung Son1, Mee Yong Shin
1Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea.
Insights
Infectious mononucleosis (IM) in Korean children is often linked to Epstein-Barr virus (EBV). Older children experienced longer fevers, more headaches, and higher rates of liver enzyme elevation.
Area of Science:
- Pediatrics
- Infectious Diseases
- Virology
Background:
- Infectious mononucleosis (IM), primarily caused by Epstein-Barr virus (EBV), is a common childhood illness.
- Limited recent data exists on the clinical status and trends of EBV-associated IM in Korean pediatric populations.
Purpose of the Study:
- To investigate the recent clinical manifestations of EBV-associated IM in Korean children.
- To analyze age-related differences in clinical and laboratory findings of EBV-associated IM.
Main Methods:
- A retrospective analysis of 81 hospitalized children diagnosed with EBV-associated IM based on serological criteria (VCA IgM positive).
- Patients were stratified into three age groups: under 5 years, 5-9 years, and 10 years or older.
- Clinical symptoms, signs, and laboratory results, including liver enzyme levels, were evaluated across age groups.
Main Results:
- The majority of patients (83.9%) were under 10 years of age.
- While most symptoms did not differ significantly by age, headache incidence increased with age.
- Duration of fever averaged 7.7 days, and liver enzyme elevation rates rose significantly with advancing age (26.6% to 76.9%).
Conclusions:
- EBV-associated IM in Korean children predominantly affects those under 10 years old.
- Clinical presentation, including headache, fever duration, and liver enzyme elevation, shows a positive correlation with increasing age.
- These findings highlight age-specific clinical patterns in pediatric EBV-associated IM in Korea.
Purpose:
Few studies have been conducted on the recent status of infectious mononucleosis (IM) in Korean children. The aim of this study was to evaluate the recent trend in the clinical manifestations of Epstein-Barr virus (EBV)-associated IM as well as the clinical differences according to age.
Methods:
A retrospective study was performed on 81 children hospitalized with EBV-associated IM who fulfilled the serological criteria for the diagnosis of EBV infection (viral capsid antigen immunoglobulin M positive). The patients were divided into 3 age groups: <5 years, 5 to 9 years, and ≥10 years. We evaluated the recent trend in clinical manifestations and the differences in clinical and laboratory findings among the 3 age groups.
Results:
Thirty (37%) children were under 5 years of age, 38 (46.9%) were 5 to 9 years of age, and 13 (16%) were 10 years of age or older. The differences in the symptoms and signs among the 3 age groups were not statistically significant, except for headache. The mean duration of fever was 7.7 days (range, 0 to 18 days). A comparison of liver enzyme elevation among the age groups showed an association with advancing age (26.6%, 63.1%, and 76.9%, respectively, P=0.04)
Conclusion:
This study showed that EBV-associated IM in Korean children continues to occur mostly in children under 10 years of age. In children with EBV-associated IM, the incidence of headache and liver enzyme elevation, the duration of fever, and the proportion of females to males were all positively associated with advancing age.
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