Pfizer or Moderna COVID-19 vaccines in human breast milk in a small study, suggesting that the mRNA preventives are safe during lactation.
The study, published in the journal JAMA Pediatrics, offers the first direct data of vaccine safety during breastfeeding and could allay concerns among those who have declined vaccination or discontinued breastfeeding due to concern that vaccination might alter human milk.
The researchers at University of California, San Francisco (USCF) in the US analysed the breast milk of seven women after they received the Pfizer and Moderna mRNA vaccines, and found no trace of the preventives.