Anaerobutyricum hallii
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Its ID gene: the stretch scientists read to tell microbes apart. Each bar is one letter of its DNA. Every species has its own order of letters, so the pattern works like a fingerprint. Close relatives share most of it.
16S rRNA gene, V4 region: the 253 letters between the standard primers (515F/806R), which are the same in every species. One reference sequence; strains can differ by a letter or two. 4 letters weren’t read clearly in it, so they’re grey, not guessed. NCBI NR_118673.1
Formerly Eubacterium hallii.
Mid-sized for a gut microbe: longer than 58% of the 2,354 we have genomes for.
38% G+C, higher than 22% of gut microbes.
To scale: if its ID gene were 1 cm long, its genome would stretch 23 meters. Yours would stretch 21 kilometers. One reference genome; strains vary. NCBI GCF_018140635.1
What it can do
- Can make butyrate A short-chain fatty acid that feeds the cells lining the colon.
- Can make propionate A short-chain fatty acid, mostly used by the liver.
- Can make lactic acid What yogurt bacteria make; other microbes turn it into butyrate.
- Mixed evidence Can ferment fiber Breaks down dietary fiber that our own enzymes can't. Published research reports it; genome analysis didn't find it in its 1 genome.
- Mixed evidence Can eat inulin A fiber in onions, garlic, leeks, chicory and bananas (also sold as FOS). Published research reports it; genome analysis didn't find it in its 1 genome.
- Can use lactose The sugar in milk and dairy.
Not seen in its genomes: eat resistant starch, eat pectin, feed on gut mucus, make B vitamins, make hydrogen sulfide, make methane.
All 13 capabilities and their evidence
| Capability | Verdict | Genome analysis | Lab tests | Published research |
|---|---|---|---|---|
| Can make butyrate | Can | 1 of 1 genome | — | Papers say yes |
| Can make propionate | Can | 1 of 1 genome | — | No papers |
| Can make lactic acid | Can | 1 of 1 genome | — | Papers say yes |
| Can ferment fiber | Mixed evidence | 0 of 1 genome | 0 of 1 strain · strip test | Papers say yes |
| Can eat inulin | Mixed evidence | 0 of 1 genome | — | Papers say yes |
| Can eat resistant starch | Not seen | 0 of 1 genome | — | No papers |
| Can eat pectin | Not seen | 0 of 1 genome | — | No papers |
| Can use lactose | Can | 1 of 1 genome | — | Papers say yes |
| Can feed on gut mucus | Not seen | 0 of 1 genome | — | No papers |
| Can change bile acids | Can | 1 of 1 genome | — | No papers |
| Can make B vitamins | Not seen | 0 of 1 genome | — | No papers |
| Can make hydrogen sulfide | Not seen | 0 of 1 genome | — | No papers |
| Can make methane | Not seen | 0 of 1 genome | — | No papers |
AGORA2 (Heinken et al. 2023) via VMH, CC BY 4.0 · BacDive (DSMZ), CC BY 4.0 · NJC19 (Lim et al., Scientific Data 2020), CC0
In healthy guts
Found in 61% of healthy people.
- largest Segatella copri 6.2%
- 2nd largest Phocaeicola vulgatus 5.0%
- 3rd largest Faecalibacterium prausnitzii 4.7%
- 4th largest Bacteroides uniformis 3.2%
- 5th largest Agathobacter rectalis 2.5%
- 6th largest Alistipes putredinis 2.3%
- 7th largest Bifidobacterium longum 2.1%
- 8th largest Ruminococcus bromii 1.8%
- top 60 Anaerobutyricum hallii 0.3%
- 2,169 other microbes, each a sliver 56.3%
- 15.6%
On average, 0.3% of the microbes in a healthy gut: among the 60 largest slices.
Every group, drawn the same way. Only some samples record age or sex, so each group says how many people it comes from. Tap one to see it above.
In conditions
Compared with healthy people in the same studies, it’s less common in 10 conditions and more common in none. Only studies that had both are counted.
A difference is an association: it doesn’t mean this microbe causes, prevents or treats any of these.
Strongest first, then the biggest gap · Each figure is 10 people- Multiple sclerosis As many carry it in people with it Healthy 85% With it 85%
Carriers have more, in 2 of 2 studies (0.23% → 0.32% of their gut microbes).
In studies of how people live
“Higher” is the study’s measure: on average, a bigger share of gut bacteria across everyone in the group, carriers or not. It isn’t how many people carry it. An association the authors report, measured once per person. It doesn’t mean a diet changes this microbe, or that the microbe affects health.
Recent research
Source: PubMed, U.S. National Library of Medicine · 178 linked papers, last 10 years
Strains studied
How much each strain has been studied in people, not whether it works. Many trials test a strain inside a blend, so those are counted apart, and reviews are summaries of trials, so they're never counted as more trials.
A. hallii WB-STR-0008
In 2 products →No human trials found yet
Human trials, meta-analyses and systematic reviews naming the strain · animal and lab studies not counted · Data sources