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This is a Quantitative Study study.

September 23, 2025mSphereOpen Access

Intra-host variation and transmission dynamics of SARS-CoV-2 Omicron outbreaks in Shandong, China

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The study identifies significant patches of shared intra-host single nucleotide variants (iSNVs) across samples, indicating potential co-mutation patterns.
The analysis utilized sequencing data from 803 samples across four transmission clusters, revealing that many samples did not share iSNVs.
Findings suggest that iSNVs may serve as reservoirs for more fixed single nucleotide polymorphisms (SNPs) within the viral genome.
The presence of shared iSNVs in unrelated samples stresses the limitations of using them alone to reconstruct transmission routes.

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Analysis reveals iSNVs in SARS-CoV-2 that indicate complex transmission dynamics, suggesting viral evolution pathways.

Wei et al. (2025) studied this question.

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