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Volume 41 Issue 5
October 2026
    Citation: Yuxin Shao, Xinyu Wang, Ziyi Su, Yueping Zeng, Guoshuang Feng, Zhengde Xie, Ran Wang. Epidemiological characteristics and in-hospital burden of infectious mononucleosis among hospitalized children in China, 2021-2023 .VIROLOGICA SINICA, 2026, 41(5) : 1045-1053.  http://dx.doi.org/10.1016/j.virs.2026.09.004
    shu

    Epidemiological characteristics and in-hospital burden of infectious mononucleosis among hospitalized children in China, 2021-2023

    • a. Laboratory of Infection and Virology, Beijing Pediatric Research Institute, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China;

    • b. Beijing Key Laboratory of Core Technologies for the Prevention and Treatment of Emerging Infectious Diseases in Children, Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing, 100045, China;

    • c. Research Unit of Critical Infection in Children, 2019RU016, Chinese Academy of Medical Sciences, Beijing, 100045, China;

    • d. Big Data Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China;

    • e. Medical Record Management Office, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China

    • This multicenter study described the epidemiological characteristics, recorded first-ranked secondary diagnoses, and in-hospital burden of pediatric infectious mononucleosis (IM) hospitalizations in China during 2021-2023. Data were obtained from the FUTURE database. We identified hospitalizations with IM as the principal discharge diagnosis from discharge-record front pages at 31 tertiary children's hospitals between January 1, 2021, and December 31, 2023, and analyzed demographic, geographic, temporal, diagnostic, length-of-stay (LOS), and expense data using descriptive statistics and multivariable regression. Among 15,239 IM hospitalizations, representing 0.42% of all hospitalizations, the male-to-female ratio was 1.34. Children aged 4-6 years comprised the largest group, followed by those aged 1-3 and 7-12 years; 70.32% were urban residents, and admissions peaked in August and September. After adjustment for age, sex, seven-category geographic area, and month, the proportion of IM hospitalizations among all hospitalizations was lower in 2023 than in 2021-2022 (adjusted rate ratio, 0.822; 95% CI, 0.784-0.861; P < 0.001). A first-ranked secondary diagnosis was recorded in 68.29% of cases; bronchitis/pneumonia was the most common category, followed by hepatic dysfunction. Median LOS was 7 days, and median hospitalization expense was CNY 5563.07. Encephalitis was recorded in only 15 cases, which had the highest observed median LOS and hospitalization expenses. These findings provide a large multicenter baseline for the epidemiological patterns and in-hospital burden of pediatric IM hospitalizations across participating tertiary children's hospitals in China and may inform future surveillance and resource planning.
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      8. Huang, Q.S., Wood, T., Jelley, L., Jennings, T., Jefferies, S., Daniells, K., Nesdale, A., Dowell, T., Turner, N., Campbell-Stokes, P., et al., 2021. Impact of the COVID-19 nonpharmaceutical interventions on influenza and other respiratory viral infections in New Zealand. Nat Commun, 12, 1001.

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      Epidemiological characteristics and in-hospital burden of infectious mononucleosis among hospitalized children in China, 2021-2023

        Corresponding author: Zhengde Xie, xiezhengde@bch.com.cn
        Corresponding author: Ran Wang, randall@mail.ccmu.edu.cn
      • a. Laboratory of Infection and Virology, Beijing Pediatric Research Institute, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China;
      • b. Beijing Key Laboratory of Core Technologies for the Prevention and Treatment of Emerging Infectious Diseases in Children, Key Laboratory of Major Diseases in Children, Ministry of Education, National Clinical Research Center for Respiratory Diseases, Beijing, 100045, China;
      • c. Research Unit of Critical Infection in Children, 2019RU016, Chinese Academy of Medical Sciences, Beijing, 100045, China;
      • d. Big Data Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China;
      • e. Medical Record Management Office, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China
      • Received Date: 09 June 2026
      • Accepted Date: 04 September 2026

      Abstract: This multicenter study described the epidemiological characteristics, recorded first-ranked secondary diagnoses, and in-hospital burden of pediatric infectious mononucleosis (IM) hospitalizations in China during 2021-2023. Data were obtained from the FUTURE database. We identified hospitalizations with IM as the principal discharge diagnosis from discharge-record front pages at 31 tertiary children's hospitals between January 1, 2021, and December 31, 2023, and analyzed demographic, geographic, temporal, diagnostic, length-of-stay (LOS), and expense data using descriptive statistics and multivariable regression. Among 15,239 IM hospitalizations, representing 0.42% of all hospitalizations, the male-to-female ratio was 1.34. Children aged 4-6 years comprised the largest group, followed by those aged 1-3 and 7-12 years; 70.32% were urban residents, and admissions peaked in August and September. After adjustment for age, sex, seven-category geographic area, and month, the proportion of IM hospitalizations among all hospitalizations was lower in 2023 than in 2021-2022 (adjusted rate ratio, 0.822; 95% CI, 0.784-0.861; P < 0.001). A first-ranked secondary diagnosis was recorded in 68.29% of cases; bronchitis/pneumonia was the most common category, followed by hepatic dysfunction. Median LOS was 7 days, and median hospitalization expense was CNY 5563.07. Encephalitis was recorded in only 15 cases, which had the highest observed median LOS and hospitalization expenses. These findings provide a large multicenter baseline for the epidemiological patterns and in-hospital burden of pediatric IM hospitalizations across participating tertiary children's hospitals in China and may inform future surveillance and resource planning.

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