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COVID-19

COVID-19 Continues to Evolve in Thailand: Studies Reveal New Insights on SARS-CoV-2

Strategic Insights

— 1 min read

Researchers at Chulalongkorn University in Bangkok, Thailand, have conducted a comprehensive study on the genetic diversity and seasonal transmission dynamics of SARS-CoV-2. The study analyzed 8,096 Acute Respiratory Infection (ARI) cases, with 1,152 samples testing positive for SARS-CoV-2, resulting in a positivity rate of 14.2%. The majority of infections occurred during the late summer to early rainy season, particularly between April and June, accounting for nearly 49% of all positive cases.

Key Takeaways:

  • The study aimed to elucidate the genetic diversity and seasonal transmission patterns of SARS-CoV-2 among patients with acute respiratory illness in Thailand in 2024.
  • The majority of SARS-CoV-2 infections occurred in adults aged 31-40 years, with no significant association between gender and infection status (p = 0.583).
  • Extensive genomic sequencing identified over seven distinct SARS-CoV-2 lineages, with the JN.1 lineage dominating early in the year.
  • Recombinant variants, notably XEC, XDV.1, and XDY, emerged as significant contributors to the evolving landscape, reaching a prevalence of 57.1% by December.
  • Phylogenetic analyses demonstrated a consistent evolutionary rate and identified critical emergence dates for new lineages, underscoring the virus's ongoing evolution in Thailand.
  • The study emphasized the necessity of continuous genomic surveillance for tracking variant transmission dynamics and managing public health responses effectively.
  • The evolving genetic landscape of SARS-CoV-2 highlights the urgent need for adaptive vaccination strategies aligned with seasonal transmission patterns in Thailand.

Statistics:

  • 8,096 Acute Respiratory Infection (ARI) cases analyzed in the study
  • Positivity rate of 14.2% for SARS-CoV-2 among ARI cases
  • 49% of all positive cases occurred during the late summer to early rainy season (April-June)
  • 1,152 samples tested positive for SARS-CoV-2
  • 7 distinct SARS-CoV-2 lineages identified through genomic sequencing
  • JN.1 lineage dominating early in the year
  • Recombinant variants (XEC, XDV.1, and XDY) reached a prevalence of 57.1% by December

Sources:

  • Seasonal trends and molecular evolution of SARS-CoV-2 in acute respiratory illness patients during the fifth year of COVID-19, Thailand. Scientific Reports, 2025;15(1):35703.
  • Nature Portfolio. (2025). Scientific Reports. Heidelberger Platz 3, Berlin, 14197, Germany. www.nature.com/srep/
  • Chulalongkorn University. Department of Pediatrics, Faculty of Medicine, Center for Excellence in Clinical Virology, Bangkok, Thailand.

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