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High-resolution epidemiological landscape from  ~290,000 SARS-CoV-2 genomes from Denmark.

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Genomic data reveals SARS-CoV-2 evolution in Denmark. Younger and older populations contributed less to viral change, while vaccinated individuals showed increased molecular evolution, indicating potential immune evasion.

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Area of Science:

  • Epidemiology
  • Genomics
  • Virology

Background:

  • Genomic surveillance is crucial for understanding pathogen evolution.
  • SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2) evolution and spread are influenced by various factors.
  • Denmark possesses rich demographic and spatial data for integrated analysis.

Purpose of the Study:

  • To investigate the drivers of SARS-CoV-2 molecular evolution and spread in Denmark during 2021.
  • To analyze the impact of demographic factors and vaccination on viral evolution.
  • To understand the spatial dynamics of SARS-CoV-2 transmission.

Main Methods:

  • Analysis of 291,791 SARS-CoV-2 genomes from Denmark in 2021.
  • Integration of genomic data with individual-level demographic data from national registers.
  • Examination of viral diversity, molecular evolutionary rates, and transmission patterns across different age groups, vaccination statuses, and geographical locations.

Main Results:

  • Consistent rise in viral diversity over time, with spikes linked to novel variant importations (Delta, Omicron).
  • Individuals aged <15 and >75 years showed lower contribution to molecular change but similar evolutionary rates.
  • Vaccinated individuals exhibited greater molecular change, suggesting immune evasion.
  • Rural transmission followed predictable diffusion; urban transmission was more complex due to high mobility.

Conclusions:

  • Integrating genomic, demographic, and spatial data provides valuable insights into pathogen dynamics.
  • Age and vaccination status influence SARS-CoV-2 molecular evolution and variant introduction.
  • Population structure significantly impacts virus spread, with distinct patterns in rural and urban settings.