Long COVID Atlas
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Plain-language first, with specialist detail below. For understanding, not medical advice.

Long COVID Atlas › Glossary › Gut dysbiosis

Microbiome

Gut dysbiosis

https://longcovidatlas.org/glossary/gut-dysbiosis

In plain language

What it is

An unhealthy shift in the mix of bacteria living in the gut.

Why it matters

Loss of helpful bacteria is linked to ongoing inflammation and long COVID symptoms.

Think of it like

A garden where the useful plants thin out and weeds take over.

From gut to whole body dysbiosis: fewer butyrate-making bacteria, more pathobionts intestinal barrier loosens (leaky gut) microbial bits (LPS) cross into the blood systemic inflammation -> fatigue, brain fog,disrupted vagus signaling
A healthy gut wall is sealed and fed by bacteria that make butyrate. After COVID those bacteria can stay depleted while the barrier loosens. Microbial fragments then leak into the blood and keep the immune system on alert. This gut-to-body loop is one proposed route from the intestine to fatigue, brain fog, and disturbed signaling along the vagus nerve.

For specialists

Formal definition

Depletion of butyrate-producing taxa (Faecalibacterium, Bifidobacterium) and enrichment of pathobionts, with reduced short-chain fatty acids.

Mechanism

Reduced butyrate and barrier integrity permit microbial translocation, fueling systemic inflammation.

Sources

Related terms

Viral reservoir