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Child health

Shifts in Epidemic Patterns and Age Dynamics of RSV, IFV, and SARS-CoV-2 in Chinese Children Following COVID-19 Non-Pharmaceutical Intervention Relaxation

Strategic Insights

— 1 min read

Following the nationwide relaxation of non-pharmaceutical interventions (NPIs) in December 2022 in China, there was considerable uncertainty regarding the resurgence and interaction patterns of major respiratory syncytial virus (RSV), influenza virus (IFV), and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A retrospective observational study analyzed comprehensive surveillance data of RSV, IFV, and SARS-CoV-2 from pediatric acute respiratory tract infection (ARTI) cases at a major maternal and child health hospital in Hubei Province, China, spanning September 2017 to August 2024. The study examined temporal trends across pre-pandemic, pandemic, and post-NPI periods, age distribution shifts across four defined age groups, and coinfection patterns.

Key Takeaways:

  • A large dataset of 105,264 RSV, 177,754 IFV, and 23,090 SARS-CoV-2 test records were analyzed, showing significant shifts in pediatric respiratory virus epidemiology following the relaxation of NPIs in China in December 2022.
  • Delayed RSV and IFV outbreaks occurred in the 2022-2023 season with unusual seasonality, with RSV peaking atypically in April, while in the 2023-2024 season, a partial return to traditional seasonality was observed.
  • Significant age distribution shifts occurred, with RSV infections increasing markedly in the 3 - 6 years age group and IFV infections surging in the 6 - 14 years age group during 2023, largely consistent with an immunity debt phenomenon.
  • SARS-CoV-2 outbreaks consistently followed the peaks of IFV and RSV, showing distinct spring and summer epidemic patterns, particularly affecting young children.
  • Coinfections of RSV and IFV remained consistently rare (about 1%).
  • The post-NPI era in China brought profound shifts in pediatric respiratory virus epidemiology, characterized by altered seasonality and age distribution for RSV and IFV, and a distinct sequential pattern for SARS-CoV-2.

Statistics:

  • 105,264 RSV test records were analyzed in the study.
  • 177,754 IFV test records were analyzed in the study.
  • 23,090 SARS-CoV-2 test records were analyzed in the study.
  • 1% of pediatric ARTI cases were coinfections of RSV and IFV.

Sources:

  • European Journal of Clinical Microbiology & Infectious Diseases, 2025.

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