TABLE 2.
Time-dependent changes in the number of living L. casei strain Shirota CFU in fecesa
| Group | Log CFU/g feces ± SE |
|||
|---|---|---|---|---|
| 8 wk before the exam | 2 wk before the exam | A few days before the exam | 2 wk after the exam | |
| Placebo | 4.3 (1/24) | 4.1 (1/24) | 3.5 ± 0.1(2/24) | 3.7 ± 0.2 (3/22) |
| L. casei strain Shirota | 3.3 (1/23) | 7.5 ± 0.2 (21/23) | 7.5 ± 0.2 (23/23) | 4.0 ± 0.4 (2/22) |
a
Fecal samples were collected at 8 weeks before (baseline), 2 weeks before, 3 to 1 days before, and 2 weeks after the examination. Feces could not be collected from 2 (placebo group) students and 1 (L. casei strain Shirota group) student. The detection limit was 3.3 log CFU/g feces. Values in parentheses show the detected number/analyzed number of subjects.