Explore the recorded discovery and history of Bifidobacterium longum, with source links and stated limits.
B. longum belongs to the human gut microbiota. Research on an infant-derived strain identified many genes for processing complex carbohydrates. This is a beneficial ecological role; effects vary by strain and context, and this profile does not recommend a probiotic product.
Gerhard Reuter describes Bifidobacterium longum in a study of bifidobacteria in infant and adult stool. This species milestone is separate from the earlier discovery of the broader bifidobacteria group.
The species name appears in the Approved Lists of Bacterial Names. This is a nomenclature milestone, not a new discovery or first colonization.
Schell and colleagues publish the genome of the human infant-derived strain NCC2705, revealing genes associated with adaptation to the gastrointestinal tract. Findings concern this strain, not every B. longum strain.
This profile describes a normal human gut resident. It does not identify a first infection or an outbreak index case. The first human colonized is not established by these references.
Source check: 2026-09-17. Educational content; independent scientific review remains pending.