The COVID vaccine does not infiltrate breast milk


(HealthDay): Women who are breastfeeding and wondering if vaccination against COVID-19 is safe for their baby may be reassured by the results of a new study.

Researchers at the University of California, San Francisco, report that “the vaccine-associated mRNA,” the active components of the Moderna and Pfizer vaccines, “was not detected in 13 milk samples collected 4 to 48 hours after vaccination from 7 individuals “.

Although a larger trial is needed to fully confirm the results, the researchers say their findings “provide important early evidence to strengthen current recommendations that vaccine-related mRNA is not transferred to the baby.” so mothers should not choose between the COVID vaccine and breastfeeding.

Pediatrician Michael Grosso, who has no connection to the study, said it “addresses an important safety issue,” because breastfeeding women were not included in COVID-19 .

“To cause any damage through “Three things have to be true,” said Grosso, who is president of pediatrics at Huntington Hospital at Northwell Health in Huntington, New York.

“First, some of the vaccine material should end up in breast milk,” he said. “Second, this material should be absorbed into the baby ‘s system [remembering that the very reason most vaccines are injected and not taken orally is that the material is simply broken down in the stomach]. Finally, if it exists and is absorbed, the vaccine material should cause damage. “

Grosso said most experts had already “agreed that none of these events were likely” and the new study seems to confirm that.

The research was led by Dr. Stephanie Gaw, of the UCSF Department of Obstetrics, Gynecology and Reproductive Sciences. Her team performed detailed, high-tech analyzes of the expressed breast milk of seven nursing mothers who were on average about 38 years old. Each had received two doses of Pfizer or Moderna .

Breast milk samples were tested for up to 48 hours after collection. No traces of vaccine mRNA were found in any sample.

The San Francisco team noted that if small amounts of mRNA, too small to be detected by their tests, still managed to reach the breast , this genetic material “would be degraded by the infant gastrointestinal system” anyway.

The researchers also noted that the World Health Organization and the Academy of Breastfeeding Medicine support the safety of breastfeeding vaccination during breastfeeding.

Grosso said other major medical organizations, including American universities of obstetrics and gynecology and the American Academy of Pediatrics, also support breastfeeding by vaccinated mothers.

“Many other vaccines have been given to nursing mothers in the past and there are no examples where these have been shown to be harmful,” Grosso added.

The study was published on July 6 a JAMA Pediatrics.

COVID-19 mRNA vaccines are immunogenic in pregnant and lactating women

More information:
Learn more about COVID-19 vaccines for breastfeeding mothers American Academy of Pediatrics.

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