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Tracking down the origin and subsequent spread of SARS-CoV-2 lineage B.1.619
Nena Bollen1, Samuel L Hong1, Barney I Potter1
1Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium.
Virus Evolution
|October 1, 2025
Summary
The SARS-CoV-2 B.1.619 lineage, known for immune escape mutations, likely originated in Cameroon in November 2020. Its spread was not significantly influenced by air travel volume.
Area of Science:
- Virology
- Epidemiology
- Genomic Surveillance
Background:
- Emergence of SARS-CoV-2 variants of concern (VOCs) necessitates genomic surveillance.
- Lineage B.1.619, identified in early 2021, possesses immune escape mutations (N440K, E484K) in the spike protein.
- Understanding the origin and spread of novel lineages is crucial for public health.
Purpose of the Study:
- To conduct a phylogeographic analysis of SARS-CoV-2 lineage B.1.619.
- To determine the geographic origin and dispersal patterns of B.1.619.
- To investigate potential drivers of lineage dispersal, such as air travel.
Main Methods:
- Phylogeographic analysis incorporating travel history-aware models.
- Genomic sequence data and associated travel information were utilized.
- Statistical analysis to assess the impact of air passenger volume on dispersal.
Main Results:
- Phylogeographic analysis estimates the origin of B.1.619 in Cameroon around November 2020.
- No significant correlation was found between air passenger numbers and B.1.619 dispersal.
- Analysis of Belgian patient data revealed diverse symptoms and interventions.
Conclusions:
- Cameroon is the estimated origin of the SARS-CoV-2 B.1.619 lineage.
- Air traffic volume does not appear to be a primary driver for B.1.619 dispersal.
- Further research is needed to understand complex viral lineage spread patterns.
Keywords:
B.1.619Bayesian inferenceCOVID-19GLMMarkov chain Monte CarloSARS-CoV-2air trafficphylogeneticsphylogeographyMore Related Videos
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