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In terms of microbial population, the stomach has very low bacterial numbers; facultative anaerobes such as lactobacilli, streptococci, and yeast are present at about 100 colony-forming units (CFU) per milliliter due to the low environmental pH
Recent molecular analysis reveals bacteria of the gastric microbiome are mainly from the phyla Proteobacteria, Firmicutes, Bacteroidetes, Actinobacteria, and Fusobacteria.