Norovirus Outbreaks in Beijing: Study Reveals Genetic Diversity and Changing Dominant Strains

Strategic Insights -

A study published in the Virology Journal has shed light on the molecular epidemiology of norovirus in Beijing, China, from 2023 to 2024. The researchers analyzed 3634 anal swab samples from children with acute gastroenteritis (AGE) and found that norovirus was detected in 19.6% of cases. The dominant genotypes of VP1 and RdRp changed between 2023 and 2024, with GII.17[P17] becoming the most common genotype in 2024.

Key Takeaways:

  • Norovirus was detected in 19.6% of AGE cases among children in Beijing from 2023 to 2024.
  • The dominant genotypes of VP1 and RdRp changed between 2023 and 2024, with GII.17[P17] emerging as the most common genotype in 2024.
  • GII.3[P12], GII.4 Sydney[P16], and GII.4 Sydney[P31] were the dominant genotypes in 2023.
  • The study found that norovirus was more common in children under 3 years old, with a detection rate of 36.39% for GII.4 and 44.59% for GII.P16.
  • The GII.17 variants in this study were divided into two clusters: cluster IIIa and IIIb, which shared high nucleotide identity with GII.17 variant emerged in 2014/2015.
  • The study highlighted the need to continuously monitor the epidemiological characteristics of norovirus-associated AGE.

Statistics:

  • 3634 anal swab samples were analyzed from children with acute gastroenteritis in Beijing from 2023 to 2024.
  • 19.6% ofsamples tested positive for norovirus.
  • 44.59% of samples tested positive for GII.P16.
  • 36.39% of samples tested positive for GII.4.
  • 20.0% of samples tested positive for GII.3[P12] in 2024.
  • GII.17[P17] was detected in 41.43% of samples in 2024.

Sources:

  • Epidemiology and genetic diversity of norovirus GII genogroups among pediatric patients in Beijing, China, during 2023-2024. Virology Journal, 2025;22(1):310.
  • Virology Journal. (BioMed Central - www.biomedcentral.com/; Virology Journal - www.virologyj.com)
  • Capital Medical University. (Beijing, People's Republic of China)
  • Beijing Children's Hospital. (National Center for Children's Health, Beijing, People's Republic of China)