Enterococcus faecalis ATCC 29212

Enterococcus faecalis is a gram-positive bacterium that is a normal inhabitant of the human gastrointestinal tract, but it is also a well-documented opportunistic pathogen associated with nosocomial (hospital-acquired) i…

Enterococcus faecium (undesignated strain) appears in the research literature primarily in the context of antibiotic resistance and hospital-associated infection rather than probiotic applications.

Enterococcus faecalis ZGBP5-53 has no primary or secondary probiotic papers linked in the research index under that strain designation; the papers associated with this entry describe in vitro fermentation of milk beverag…

Escherichia coli K12 is a non-pathogenic laboratory reference strain that has been central to molecular biology and genetics research since the mid-20th century.

Escherichia coli ATCC 25922 is a well-characterized reference strain used as a quality control organism in antimicrobial susceptibility testing and microbiological laboratory work — it is not a probiotic strain.

Enterococcus faecium SF68 has a history of use as a probiotic, particularly in veterinary and some human applications, with research conducted in the context of diarrhea management.