Why is Lactobacillus missing?

Most Lactobacillus species are not colonisers of the adult human gut and are usually transient from diet or probiotics.
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- Only a couple of Lactobacillus species may colonise the gut long-term, and these are still rare in industrialised populations.
- In contrast, in animals like mice, Lactobacillus species do colonise the gut — which is why animal studies often show a high Lactobacillus abundance.
- Studies that use the NCBI taxonomic classification system misclassify a common gut species, Lachnospira rogosae, as Lactobacillus, making Lactobacillus appear more prevalent than it really is.
By using the updated taxonomic classification system (Genome Taxonomy Database - GTDB), Microbiome Explorer avoids this issue and reports Lactobacillus accurately.
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​https://doi.org/10.1128/AEM.00753-08

https://insight.microba.com/blog-practitioner-why-some-lactobacilli-arent-who-they-seem/"