Relative abundance and frequency of dominant phyla, families and genera in fecal samples obtained at 4 months from 24 healthy Canadian infants
| Taxon* | Relative abundance,† %, median (IQR) | Frequency, no. (%) of infants |
|---|---|---|
| Actinobacteria | 36.4 (10.9–69.5) | 19 (79.2) |
| Bifidobacteriaceae | 35.2 (0.3–68.3) | 18 (75.0) |
| Bifidobacterium | 35.2 (0.3–68.3) | 18 (75.0) |
| Coriobacteriaceae | 0.0 (0.0–0.6) | 11 (45.8) |
| Eggerthella | 0.0 (0.0–0.4) | 8 (33.3) |
| Bacteroidetes | 0.0 (0.0–0.8) | 9 (37.5) |
| Bacteroidaceae | 0.0 (0.0–0.8) | 9 (37.5) |
| Bacteroides | 0.0 (0.0–0.8) | 9 (37.5) |
| Proteobacteria | 7.4 (2.8–21.5) | 24 (100.0) |
| Enterobacteriaceae | 7.4 (2.8–20.9) | 24 (100.0) |
| Escherichia–Shigella | 5.3 (2.4–14.6) | 20 (83.3) |
| Firmicutes | 43.8 (15.3–74.9) | 24 (100.0) |
| Clostridiaceae | 0.1 (0.0–2.0) | 12 (50.0) |
| Clostridium | 0.1 (0.0–2.0) | 12 (50.0) |
| Enterococcaceae | 0.4 (0.0–1.9) | 15 (62.5) |
| Enterococcus | 0.4 (0.0–1.9) | 15 (62.5) |
| Erysipelotrichaceae | 0.8 (0.0–6.8) | 14 (58.3) |
| Lachnospiraceae | 14.2 (5.7–35.8) | 22 (91.7) |
| Blautia | 0.0 (0.0–0.6) | 6 (25.0) |
| Peptostreptococcaceae | 0.0 (0.0–1.5) | 11 (45.8) |
| Ruminococcaceae | 0.0 (0.0–0.6) | 8 (33.3) |
| Streptococcaceae | 1.1 (0.3–5.3) | 20 (83.3) |
| Streptococcus | 1.1 (0.3–5.3) | 20 (83.3) |
| Veillonellaceae | 0.9 (0.0–7.5) | 17 (70.8) |
| Veillonella | 0.9 (0.0–7.5) | 16 (66.7) |
Note: IQR = interquartile range.
↵* Unclassified genera are not listed but are included within their respective family and phylum counts. Taxa present in only 1 infant or that had an interquartile range of 0.0–0.0 are omitted.
↵† Values represent the percentages of all 16S gene sequences analyzed, after quality processing as described in Appendix 1 (available at www.cmaj.ca/lookup/suppl/doi:10.1503/cmaj.121189/-/DC1).