This is a prospective collaborative observational study coordinated by the Neonatal Care Unit and the Laboratory of Molecular Virology of the University of Turin, Italy.
The study was approved by the local Ethical Committee (protocol number 0039684), and informed consent to participate in the study was obtained from each mother.
The study centers were located in North–West Italy. From April 1st 2020 to July 31st 2020, these centers collected samples of milk from 14 breastfeeding mothers diagnosed with Covid-19.
All the mothers were diagnosed with COVID-19 by real-time reverse-transcriptase–polymerase-chain-reaction (RT-PCR) assays of nasal and pharyngeal swabs, in accordance with WHO guidance (16). We collected clinical records, breastfeeding history, and laboratory findings related to SARS-CoV-2 of 14 mothers and their infants during hospital stay and in the 6 weeks after discharge.
Newborn follow up was performed during the first month of life or until the finding of two sequential negative swabs.
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