02May 2022
Lost microbes of COVID-19: <em>Bifidobacterium</em>, <em>Faecalibacterium</em> depletion and decreased microbiome diversity associated with SARS-CoV-2 infection severity

Lost microbes of COVID-19: <em>Bifidobacterium</em>, <em>Faecalibacterium</em> depletion and decreased microbiome diversity associated with SARS-CoV-2 infection severity

The study objective was to compare gut microbiome diversity and composition in SARS-CoV-2 PCR-positive patients whose symptoms ranged from asymptomatic to severe versus PCR-negative exposed controls. Using a cross-sectional design, the study performed shotgun next-generation sequencing on stool samples to evaluate gut microbiome composition and diversity in patients with SARS-CoV-2 PCR-confirmed infections, which had presented to Ventura Clinical Trials for care from March 2020 through October 2021 and SARS-CoV-2 PCR-negative exposed controls. The study hypothesises that low bacterial diversity and depletion of Bifidobacterium genera either before or after infection led to reduced proimmune function, thereby allowing SARS-CoV-2 infection to become symptomatic. This dysbiosis pattern may be a susceptibility marker for symptomatic severity from SARS-CoV-2 infection and may be amenable to preinfection, intrainfection or postinfection intervention.

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