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Updated: May 24, 2025

Quantification and Whole Genome Characterization of SARS-CoV-2 RNA in Wastewater and Air Samples
Published on: June 30, 2023
Fine-scale patterns of SARS-CoV-2 spread from identical pathogen sequences.
Cécile Tran-Kiem1, Miguel I Paredes2,3, Amanda C Perofsky4,5
1Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Center, Seattle, WA, USA. ctrankie@fredhutch.org.
Analyzing identical SARS-CoV-2 genomes reveals fine-scale transmission patterns. This genomic surveillance approach identified transmission links, including between correctional facilities, and highlighted age-related spatial transmission dynamics.
Area of Science:
- Genomic epidemiology
- Infectious disease surveillance
- Computational biology
Background:
- Pathogen genomics offers insights into infectious disease transmission dynamics.
- Large-scale genomic datasets require advanced analytical methods for full potential realization.
- Genetically similar pathogen sequences often indicate direct epidemiological linkage.
Purpose of the Study:
- To develop and apply novel methods for analyzing large-scale pathogen genome datasets.
- To characterize fine-scale transmission patterns of SARS-CoV-2 using genomic data.
- To investigate the relationship between genetic proximity, mobility, and transmission.
Main Methods:
- Utilized 114,298 SARS-CoV-2 genomes from Washington State (March 2021-December 2022).
- Analyzed pairs of identical sequences to identify transmission events and patterns.
- Integrated genomic data with demographic (age) and geographic (residence location) information.
Main Results:
- Identified high consistency between the geographic locations of identical sequence pairs and mobility data.
- Detected SARS-CoV-2 transmission between correctional facilities, explaining deviations from expected mobility patterns.
- Observed varying transmission patterns between age groups across different spatial scales and identified age groups driving transmission.
Conclusions:
- Pairs of identical pathogen sequences are valuable for fine-scale transmission analysis.
- Genomic surveillance effectively identifies transmission hotspots and links, such as within correctional facilities.
- Understanding age-related and spatially stratified transmission is crucial for controlling infectious disease spread.
Related Concept Videos
Evolutionary Relationships through Genome Comparisons
Single Nucleotide Polymorphisms-SNPs
Viral Mutations
Viral Recombination
Sanger Sequencing

