Yarden Golan, the lead author of the study and a postdoctoral fellow at UCSF said, "We didn't detect the vaccine-associated mRNA in any of the milk samples tested."
Stephanie L Gaw, corresponding author of the study and an assistant professor at UCSF said, "The results strengthen current recommendations that the mRNA vaccines are safe in lactation, and that lactating individuals who receive the COVID vaccine should not stop breastfeeding."