Table A2.

Shift in the most dominant phyla of gut bacteria across the human lifespan.

	Age Range	Most Prevalent Phyla	Common Genera
Infancy	0–3 years	Actinobacteria	Propionibacterium, Rothia, Actinomyces, Bifidobacterium, Collinsella, Eggerthella, Mobiluncus
		Proteobacteria	Escherichia, Shigella, Aggregatibacter, Eikenella
		Firmicutes	Enterococcus, Gemella, Staphylococcus, Streptococcus, Anaerococcus, Granulicatella, Lactobacillus, Peptoniphilus, Veillonella, Anaerostipes, Anaerotruncus, Costridium, Megasphaera, Roseburia, Ruminococcus
		Bacteroidetes	Bacteroides
		Fusobacteria	Fusobacterium
Adult	3–70 years	Firmicutes	Enterococcus, Gemella, Staphylococcus, Streptococcus, Anaerococcus, Granulicatella, Lactobacillus, Peptoniphilus, Veillonella, Anaerostipes, Anaerotruncus, Costridium, Megasphaera, Roseburia, Ruminococcus
		Bacteroidetes	Bacteroides
		Actinobacteria	Propionibacterium, Rothia, Actinomyces, Bifidobacterium, Collinsella, Eggerthella, Mobiluncus
		Proteobacteria	Escherichia, Shigella, Aggregatibacter, Eikenella
		Verrucomicrobia	Akkkermansia
Elderly	70 years and older	Firmicutes	Enterococcus, Gemella, Staphylococcus, Streptococcus, Anaerococcus, Granulicatella, Lactobacillus, Peptoniphilus, Veillonella, Anaerostipes, Anaerotruncus, Costridium, Megasphaera, Roseburia, Ruminococcus
		Actinobacteria	Propionibacterium, Rothia, Actinomyces, Bifidobacterium, Collinsella, Eggerthella, Mobiluncus
		Bacteroidetes	Bacteroides
		Proteobacteria	Escherichia, Shigella, Aggregatibacter, Eikenella
		Verrucomicrobia	Akkermansia

Table of Microbiome: Depiction of the shift in gut flora across the human life span. The most prevalent phyla column for each age range is ordered from most prevalent to lower levels of prevalence. The common genera depicted for each phyla does not represent all members of the gut flora, however, it represents the most prevalent organisms populating the gut [117,118,119].