Gut bacteria tied to disease severity, immune response; high mental health toll seen in ICUs

Just replace virus with Accutane, Fin, SSRIs etc.

Gut bacteria tied to COVID-19 severity, immune response

The microscopic organisms living in our intestines may influence the severity of COVID-19 and the body’s immune response to it, and could account for lingering symptoms, researchers reported on Monday in the journal Gut. They found that the gut microorganisms in COVID-19 patients were very different from those in uninfected individuals. “COVID patients lack certain good bacteria known to regulate our immune system,” said Dr. Siew Ng of The Chinese University of Hong Kong. The presence of an abnormal assortment of gut bacteria, or “dysbiosis,” persists after the virus is gone and could play a role in the long-lasting symptoms that plague some patients, she said.

On a side note, I think you absolutely need to be able to generate heat, whether thats the brain, head, skin, eyes, penis, gum tissue.
Those feeling some type of unusual coldness or even drop in body temp could be in the most trouble possibly.

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So FMT might work on some cases if this would be one of the keys?

They are not even sure why FMT work in some and not in others when it comes to treatment of C.diff for example. Its the same with probiotics, its too non-specific. Take the (s) off of probiotics. Believe me there are plenty of bacteria that you dont want, that could make your situation worse. In that regard FMT does not make sense to me.
It would need to be a targeted approach and you need to know the specific characteristic or traits of select bacteria.
In regards to this and the article above, this is what im looking at right now.
A specific trait could be retinoic acid metabolism that could help regulate the immune system.

Portrait of an immunoregulatory bifidobacterium

I’ll add to this, also what about tryptophan metabolism?

Role for Metabolic Factors in Probiotic-Mediated Immunoregulation

Konieczna et al. demonstrate that induction of vitamin A and tryptophan metabolic pathways in DCs by B. infantis is important for adaptive immune cell responses.13 These metabolic pathways are recognized participants in immunoregulatory mechanisms. That food-grade microbes deploy these mechanisms raises the possibility of a new link between diet, microbiota, metabolism and immunoregulation. Simply put, B. infantis administration to an individual, with a diet deficient in vitamin A and/or tryptophan, may not be as effective as B. infantis administration to an individual with a diet incorporating sufficient quantities of these nutrients. At present this is a hypothesis, however recent findings regarding other dietary factors support that certain dietary factors may be important for microbiota and probiotic-associated immunoregulation.35 For example, microbial fermentation of dietary oligosaccharides results in short chain fatty acid secretion and immunoregulation via GPCR41 and GPCR43.36