COVID Vaccines Contaminate Breastmilk With mRNA: Study

A health worker administers a dose of the Pfizer-BioNtech COVID-19 vaccine to a pregnant woman at Clalit Health Services, in Israel's Mediterranean coastal city of Tel Aviv on Jan. 23, 2021. Jack Guez/AFP via Getty Images

A new study published on the JAMA network concludes that mRNA from COVID vaccines can be transmitted in small amounts through breast milk.

The authors of the study examined 11 “lactating individuals,” after getting either the Pfizer or Moderna mRNA shots.