Table 1.

Balance of beneficial vs. detrimental commensal enteric bacterial species helps determine intestinal homeostasis vs. inflammation

Potentially injurious species in susceptible hostsProtective species
Bacteroides vulgatus, B. thetaiotaomicronLactobacillus species
Escherichia coli (adherent/invasive)Bifidobacterium species
Enterococcus faecalis (nonpathogenic)Escherichia coli
Klebsiella pneumoniaeBacteroides thetaiotaomicron
Fusobacterium variumFaecalibacterium prausnitzii
Helicobacter hepaticus and other intestinal species
Bifidobacterium animalis