Evaluation of Adverse Effects in Nursing Mothers and Their Infants After COVID-19 mRNA Vaccination.

Breastfeeding women are generally excluded from clinical trials with new vaccines. The objective of the study was to explore whether the BNT162b2 mRNA and mRNA-1273 COVID-19 vaccines are safe for breastfeeding mothers and their breastfed infants. A convenience sample prospective cohort single institution study was performed on breastfeeding health care professionals, who were exposed to second dose of SARS-CoV2 vaccine at the beginning of the study period.

SARS-CoV-2 Antibodies in Breast Milk After Vaccination.

Background And Objectives: Passive and active immunity transfer through human milk (HM) constitutes a key element in the infant's developing immunity. Certain infectious diseases and vaccines have been described to induce changes in the immune components of HM.

Methods: We conducted a prospective cohort single-institution study from February 2 to April 4, 2021.