What does this research mean for the field?

SARS-CoV-2 intrahost variation is limited and infrequently transmitted during acute infections, making shared intrahost single nucleotide variants highly specific but insensitive markers for inferring transmission events. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Investigate within-host SARS-CoV-2 genetic variation to determine its utility for tracing transmission chains and assessing selective evolutionary pressures.

September 8, 2026Microbial GenomicsOpen Access

SARS-CoV-2 intra-host variation shows evidence of transmission and convergent evolution in a university surveillance cohort

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Authors

LCLéa CavalliCenter for Disease Dynamics, Economics & Policy BTBradford P. TaylorCenter for Disease Dynamics, Economics & Policy BSBeau SchaefferCenter for Disease Dynamics, Economics & Policy

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Implication

Genomic surveillance study uncovers limited transmission of intrahost viral variants in university cases, suggesting restricted utility for acute contact tracing.

Key Points

Investigate within-host SARS-CoV-2 genetic variation to determine its utility for tracing transmission chains and assessing selective evolutionary pressures.
Analyzed intrahost single nucleotide variants (iSNVs) from SARS-CoV-2 whole-genome sequences collected through a mandatory university surveillance program.
Applied stringent bioinformatic filtering and designed a heuristic framework to remove contamination artifacts caused by batched sequencing.
Intrahost variation was restricted and rarely transmitted onward during acute infection, demonstrating that shared iSNVs provide high specificity but low sensitivity for tracking transmission.
Incomplete purifying selection shaped within-host viral populations, with target loci shifting across different variants of concern.
Detected a recurrent iSNV (G11083T) across multiple lineages, highlighting a probable locus of convergent positive selection.

Cite This Study

Cavalli et al. (2026) studied this question.

synapsesocial.com/papers/6a9fd70a58e84d0ff5b4585e https://doi.org/10.1099/mgen.0.001784

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Implication

Genomic surveillance study uncovers limited transmission of intrahost viral variants in university cases, suggesting restricted utility for acute contact tracing.

SARS-CoV-2 intra-host variation shows evidence of transmission and convergent evolution in a university surveillance cohort

Discussion

Member takes

Implication

Key Points

Cite This Study

SARS-CoV-2 intra-host variation shows evidence of transmission and convergent evolution in a university surveillance cohort

Discussion

Member takes

Implication

Key Points

Cite This Study

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