Phascolarctobacterium can produce short-chain fatty acids, including acetate and propionate, and can be associated with the metabolic state and mood of the host. The present study investigated the colonization characteristics of Phascolarctobacterium faecium in healthy individuals <1-80 years old in Southern China. A total of 150 fresh fecal samples were collected, and bacterial DNA was isolated from these samples for quantitative polymerase chain reaction analysis. Phascolarctobacterium faecium demonstrated a high colonization rate and abundant colonization in the human gastrointestinal tract. The colonization rate varied between 43.33‑93.33%, and the abundance of Phascolarctobacterium faecium ranged between 3.22‑5.76 log cells g‑1 (<1 years old) and 3.06‑9.33 log cells g‑1 (>1 year old). The permillage of Phascolarctobacterium faecium in total bacteria ranged between 0.004‑1.479. There was presence of Phascolarctobacterium faecium‑like bacteria in younger individuals with a gradual increase in the number of bacteria maintained at a high level with increasing ages (between 1 and 60 years old), but with a decrease in elderly individuals (>60 years old). The results of the present study demonstrated that Phascolarctobacterium faecium is abundantly colonized in the human gastrointestinal tract.

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