TABLE 1.
Samples, description, and selection of bifidobacteria by F-6-PPK detection
| Sample no. | Full-term or preterm | Age | Feedinga | Antibiotic treatment (duration [days])b | Count on mMRS + MUP (CFU/swab)c | No. of colonies assessed | No. of F-6-PPK-positive colonies (%) |
|---|---|---|---|---|---|---|---|
| 1 | Full-term | 4 days | F | None | 0 | 0 | |
| 2 | Preterm | 3 wk | B | AMP + GEN (5) | Swab streak | 13 | 1 (7.7) |
| 3 | Preterm | 5 days | B | None | Swab streak | 10 | 0 (0) |
| 4 | Full-term | 4 days | F | None | 0 | 0 | |
| 5 | Full-term | 3 wk | B | None | Swab streak | 12 | 0 (0) |
| 6 | Full-term | 4 days | F | None | 0 | 0 | |
| 7 | Full-term | 4 days | F | AMP + GEN (2) | 0 | 0 | |
| 8 | Full-term | 3 days | F | None | Swab streak | 11 | 11 (100) |
| 9 | Preterm | 39 days | B + F | AMP + GEN (5), CEF + TEI (5) | 0 | 0 | |
| 10 | Preterm | 12 days | B + F | AMP | <10 | 0 | |
| GEN (5) | |||||||
| 11 | Preterm | 5 days | F | AMP + GEN (2) | 0 | 0 | |
| 12 | Preterm | 4 days | B + F | AMP + GEN (2) | One colony | 0 | |
| 13 | Preterm | 8 days | B | AMP + GEN (2) | 0 | 0 | |
| 14 | Preterm | 2 wk | B | AMP + GEN (2) | 6 × 107 | 12 | 0 (0) |
| 15 | Full-term | 4 days | B | AMP + GEN (2) | 7 × 103 | 1 | 0 (0) |
| 16 | Full-term | 4 days | B | None | 4 × 105 | 11 | 9 (81.8) |
| 17 | Full-term | 4 days | F | None | 1 × 104 | 12 | 0 (0) |
| 18 | Full-term | 10 days | B + F | None | 1 × 104 | 2 | 0 (0) |
| 19 | Preterm | 1 wk | B | AMP + GEN (2) | 5 × 101 | 12 | 0 (0) |
| 20 | Full-term | 3 days | F | None | 7 × 106 | 12 | 12 (100) |
| 21 | Preterm | 4 days | B | AMP + GEN (2) | 0 | 0 | |
| 22 | Preterm | 6 wk | B + F | None | 4 × 105 | 7 | 1 (14.3) |
| 23 | Full-term | 5 days | B | None | 5 × 106 | 12 | 12 (100) |
| 24 | Preterm | 2 mo | B + F | None | 4 × 107 | 2 | 0 (0) |
a
B, breast-feeding; F, formula.
b
AMP, ampicillin; GEN, gentamicin; CEF, cefotaxime; TEI, teicoplanin.
c
Swab streak, swab that was streaked directly onto an agar plate. MUP, mupirocin.