Median and range of faecal bacterial counts (CFUs/g wet weight of faeces) of colonised infants and the colonisation rates at 3, 10, 30, 60, and 180 days of age
| 3 days | 10 days | 30 days | 60 days | 180 days | |
| Total bacteria | |||||
| Median | 10.6 | 11.1 | 11.1 | 11.2 | 11.2 |
| Range | 7.0–11.9 | 9.3–12.1 | 10.2–11.9 | 10.1–13.7 | 9.9–13.5 |
| Colonisation rate | 64/64 (100) | 59/59 (100) | 62/62 (100) | 62/62 (100) | 51/51 (100) |
| Aerobic enteric bacteria | |||||
| Median | 9.7 | 9.7 | 9.7 | 9.7 | 9.5 |
| Range | 6.6–10.9 | 8.1–12.0 | 7.2–11.0 | 6.6–13.1 | 7.5–11.7 |
| Colonisation rate | 63/64 (98) | 57/57 (100) | 62/62 (100) | 62/62 (100) | 51/51 (100) |
| Bacteroides fragilis group bacteria | |||||
| Median | 8.7 | 9.3 | 9.4 | 9.3 | 9.5 |
| Range | 4.8–10.2 | 4.0–10.4 | 5.5–10.6 | 5.5–11.1 | 5.5–12.3 |
| Colonisation rate | 23/63 (37) | 16/58 (28) | 21/60 (35) | 30/62 (48) | 30/51 (59) |
| Lactobacillus-like bacteria | |||||
| Median | 7.8 | 8.8 | 9.3 | 9.0 | 9.2 |
| Range | 6.4–10.2 | 6.5–10.5 | 6.6–10.3 | 5.7–10.9 | 5.8–10.1 |
| Colonisation rate | 7/64 (11) | 14/58 (24) | 21/62 (47) | 29/62 (47) | 23/51 (45) |
| Bifidobacterium-like bacteria | |||||
| Median | 10.1 | 10.7 | 10.8 | 10.9 | 10.9 |
| Range | 5.1–11.1 | 5.1–11.8 | 6.4–11.6 | 7.2–11.8 | 8.9–12.1 |
| Colonisation rate | 39/63 (62) | 45/58 (78) | 54/60 (90) | 55/61 (90) | 47/49 (96) |
| Clostridium perfringens | |||||
| Median | 7.3 | 6.9 | 8.1 | 6.9 | 6.7 |
| Range | 3.8–8.7 | 4.1–9.1 | 4.5–9.5 | 5.8–10.0 | 5.5–9.0 |
| Colonisation rate | 7/64 (11) | 11/58 (19) | 21/57 (37) | 14/56 (25) | 11/49 (22) |
Values in parentheses are percentages.