Table 1.
Characteristics of the study population and results of SARS-CoV-2 search in milk samples.
| Maternal age (years) | Gestational age at delivery (weeks) | Method of delivery | Interval between delivery and milk collection (days) | Interval between maternal positive swab and milk collection (days)° | Maternal symptoms at milk collection | Breast milk test | First maternal positive swab (days before (–) or after (+) delivery) | First maternal negative swab (days after delivery) | |
|---|---|---|---|---|---|---|---|---|---|
| Case 1 | 25 | 40 | Vaginal | 27 | 0 | No | Negative | +3 | 41 |
| Case 2□ | 28 | 37 | Vaginal | 14 | 0 | No | Negative | 0 | 25 |
| Case 3□ | 26 | 38 | CS | 5 | 4 | Yes | Positive | +1 | 34 |
| Case 4* | 30 | 36 | Vaginal | 4 | 5 | Yes | Negative | −1 | 23 |
| Case 5 | 34 | 38 | CS | 21 | 6 | No | Negative | 0 | 24 |
| Case 6 | 35 | 30 | CS | 3 | 0 | Yes | Negative | −8 | 33 |
| Case 7 | 30 | 39 | CS | 27 | 0 | No | Negative | +1 | 45 |
| Case 8** | 38 | 32 | CS | 2 | 12 | Yes | Negative | −9 | 3 |
| Case 9□ | 24 | 34 | CS | 4 | 5 | No | Negative | 0 | 9 |
| Case 10 | 29 | 41 | Vaginal | 13 | 10 | No | Negative | −1 | 16 |
| Case 11 | 37 | 38 | CS | 4 | 5 | No | Negative | −11 | 16 |
| Case 12 | 31 | 40 | Vaginal | 3 | 3 | Yes | Negative | 0 | 23 |
| Case 13 | 37 | 37 | CS | 1 | 0 | Yes | Negative | −18 | 20 |
| Case 14 | 32 | 37 | CS | 3 | 0 | No | Negative | −1 | 14 |
*
Mother decided to stop breastfeeding at discharge (day 5).
**
Mother with interstitial pneumonia. Ritonavir/Lopinavir therapy discontinued 3 days before the milk collection.
□
Manual expression.
°
We considered the time interval as 0 if the milk collection took place between the recording of two positive maternal swabs.