What does this research mean for the field?

Increasing COVID-19 severity is associated with a reproducible depletion of oral commensal bacteria, most consistently Gemella, rather than an increase in bacterial resistance-gene burden or significant host gene-expression changes. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To characterize the respiratory microbiome and host transcriptional dynamics associated with COVID-19 severity across multi-omic sequencing platforms.

August 22, 2026Communications BiologyOpen Access

High-resolution multi-omics defines respiratory microbiome and host signatures of COVID-19 severity

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Authors

DADeyvid AmgartenHospital Israelita Albert Einstein FMFernanda de Mello MaltaHospital Israelita Albert Einstein RFRaquel Riyuzo de Almeida FrancoID Genomics (United States)

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Implication

Observational multi-omics profiling reveals depletion of oral commensal bacteria in severe COVID-19, indicating a distinctive microbial signature of disease severity.

Key Points

To characterize the respiratory microbiome and host transcriptional dynamics associated with COVID-19 severity across multi-omic sequencing platforms.
Profiled naso-oropharyngeal swab samples from 561 individuals using marker-gene amplicon sequencing, total-RNA metatranscriptomics, and shotgun DNA metagenomics.
Recovered 190 microbial genomes, monitored SARS-CoV-2 viral lineages, and analyzed respiratory co-infections, host gene expression, and antibiotic resistance-gene burden.
Severe COVID-19 was consistently characterized by a reproducible depletion of oral commensal bacteria—predominantly Gemella, alongside Rothia and Haemophilus—across all three sequencing platforms.
Microbial shifts included alterations in metabolic and stress-response pathways, whereas bacterial antibiotic resistance-gene burden did not increase with antibiotic use or disease severity.

Cite This Study

Amgarten et al. (2026) studied this question.

synapsesocial.com/papers/6a895eeeca7ade938187d214 https://doi.org/10.1038/s42003-026-10774-z

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Implication

Observational multi-omics profiling reveals depletion of oral commensal bacteria in severe COVID-19, indicating a distinctive microbial signature of disease severity.

High-resolution multi-omics defines respiratory microbiome and host signatures of COVID-19 severity

Discussion

Member takes

Implication

Key Points

Cite This Study

High-resolution multi-omics defines respiratory microbiome and host signatures of COVID-19 severity

Discussion

Member takes

Implication

Key Points

Cite This Study

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