19/02/2026
How does a Microbiome Analyst approach norovirus recovery? Any acute viral or bacterial infection can have a strong (ideally temporary) effect on our gut microbiome, including decreases in diversity and beneficial bacterial species, alongside blooms in inflammatory species. How quickly your microbiome recovers depends on the balance of bacterial populations at the time of infection and microbiome diversity, as well as what foods are introduced after infection.
I turned to probiotics as soon as symptoms began. As is often the way with noro, symptom onset was sudden, so I couldn’t face taking prebiotic supplements that may have buffered against microbiome changes.
Unfortunately I had run out of the beneficial yeast S boulardii, which has some clinical trial data showing it can help speed symptom improvement in adults with norovirus. So I turned to L rhamnosus GG. While it has protective effects during diarrhea and antibiotic use, there are limited clinical trial data available for treating adults with viral gastroenteritis (with mixed results) and some data showing effectiveness in treating viral gastroenteritis in children.
I took L rhamnosus GG capsules three times daily, but during the worst symptoms, I could only focus on rehydration with regular teaspoons of sugar-salt water (see WHO guidance for proportions). I was grateful that the worst symptoms lasted less than 24h — thanks in part to a healthy gut microbiome!
Once the symptoms began to subside I could begin taking prebiotic supplements I know to be beneficial for my individual microbiome composition. Reintroducing food was then of course gradual, but I initially focused on getting gentle fibre, with well-steamed veg, including carrots and potatoes, that are rich in pectin.
While my gut was still very sensitive, I avoided too much “roughage“ (like bran). However pectin provides the bulk the colon needs for mechanical stimulation to induce the natural contractions (peristalsis) required for bowel movements. When the colon has been emptied by acute viral diarrhoea, it can take a while for normal bowel movements to resume, due to lack of that mechanical stimulation as well as residual inflammation. It’s important to keep attending to hydration because pectin also forms a water-holding gel in the colon that helps produce soft yet firm stools.
As I approached the end of the 48h infectious window after my last symptoms, I enjoyed this pre-prepped purple stir-fry mix (ordered through a supermarket delivery so I didn’t contribute to norovirus spread). I chose this mix both for the minimal food prep and for the purple polyphenols and prebiotics (from a small amount of red onion and garlic) that would feed my anti-inflammatory gut bacteria.
The mix contained collard greens, red cabbage, purple sprouting broccoli, watermelon radish, peas, green beans, red onion, ginger and garlic. I cooked the veg a bit longer than usual to ease digestion and served it with white basmati rice cooked with turmeric for its anti-inflammatory and microbiome-nourishing properties.
Save this post and share with friends who are unfortunate enough to need it! In the meantime, remember soap and water is more effective than hand sanitisers to prevent the spread of norovirus.
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The Microbiome Group practitioners receive no affiliate fees or commission for any supplements described here or those we recommend to clients. I’m unable to advise whether certain probiotics or prebiotics are appropriate for you outside of a consultation and case history.
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REFERENCES
Curr Op Microbiology 2022, 66:79-85 PMID: 35149372.
BMC Gastroenterol. 2023 3;23:229 PMID: 37400812
Aliment Pharmacol Ther. 2007 15;25(8):871-81. PMID: 17402990.
✏️📸 Viola
IMAGES: 1) shredded purple and green veg, 2) yellow rice and veg in a white bowl on a wooden surface.
