Characteristics of term infants in study population
| Infant | Age, wk | Sex | Mode of delivery | Premature rupture of membranes > 24 h | Group B streptococcal culture | Breastfeeding at time of fecal sampling | Use of antibiotics | |
|---|---|---|---|---|---|---|---|---|
| Mother (timing) | Infant (age) | |||||||
| Vaginal delivery, not breastfeeding | ||||||||
| A | 23 | F | Vaginal | No | No | None | Cephalexin (31 WG) | Mother could not recall |
| B | 18 | F | Vaginal | No | Yes | None | Penicillin G (labour) | None |
| C | 22 | F | Vaginal | No | No | None | None | Mother could not recall |
| D | 15 | F | Vaginal | Yes | No | None | None | Ampicillin and gentamicin (2 d) |
| E | 13 | M | Vaginal | No | Yes | None | Azithromycin (20 WG); Penicillin G (labour) | None |
| F | 23 | M | Vaginal | No | Unknown | None | Unknown | None |
| G | 16 | M | Vaginal | No | Yes | None | Penicillin G (labour) | None |
| Vaginal delivery, breastfeeding | ||||||||
| H | 14 | F | Vaginal | No | No | Exclusive | None | None |
| I | 17 | F | Vaginal | Yes | No | Partial | None | None |
| J | 15 | M | Vaginal | No | Unknown | Exclusive | Ampicillin (after delivery) | None |
| K | 18 | M | Vaginal | No | No | Exclusive | None | None |
| L | 15 | M | Vaginal | No | No | Exclusive | None | None |
| M | 21 | F | Vaginal | No | Yes | Partial | None | None |
| N | 11 | F | Vaginal | No | No | Partial | None | None |
| O | 20 | F | Vaginal | No | No | Exclusive | None | None |
| P | 19 | F | Vaginal | No | No | Exclusive | None | None |
| Q | 21 | F | Vaginal | Yes | No | Exclusive | None | None |
| R | 20 | M | Vaginal | No | No | Exclusive | None | None |
| Cesarean delivery, not breastfeeding | ||||||||
| S | 17 | F | Cesarean, EM | No | No | None | Cefazolin (preop); cefazolin and metronidazole (postop) | None |
| T | 14 | M | Cesarean, EM | No | No | None | Cefazolin (postop) | None |
| Cesarean delivery, breastfeeding | ||||||||
| U | 15 | M | Cesarean, EL | No | Unknown | Partial | Cefazolin (preop) | Amoxicillin (6 wk) |
| V | 18 | M | Cesarean, EL | No | Unknown | Exclusive | Cephalexin (postop) | None |
| W | 18 | M | Cesarean, EM | No | Yes | Partial | Penicillin G (labour) | None |
| X | 16 | M | Cesarean, EL | No | No | Exclusive | Clindamycin (preop) | Amoxicillin (12 wk) |
Note: EL = elective, EM = emergency, preop = preoperatively, postop = postoperatively, WG = weeks gestation.