Intra-specific composition and succession of Bifidobacterium longum in human feces

SummaryIntra-species analysis of pulsed field gel electrophoresis (PFGE) on human fecal Bifidobacterium longum isolates revealed that a majority of 12 Japanese subjects harbored strains of unique PFGE types or subtypes over a 68-week period, suggesting that “indigenous” Bifidobacterium strains remain stable for a considerable time in each individual intestinal microbiota.