The breast milk of lactating mothers vaccinated against COVID-19 contains a significant supply of antibodies that may help protect nursing infants from the illness, according to new research from the University of Florida.
The study was published in the journal Breastfeeding Medicine and was funded by the Children's Miracle Network.
"Our findings show that vaccination results in a significant increase in antibodies against SARS-CoV-2 -- the virus that causes COVID-19 -- in breast milk, suggesting that vaccinated mothers can pass on this immunity to their babies, something we are working to confirm in our ongoing research," said Joseph Larkin III, PhD, senior author of the study and an associate professor in the UF/IFAS department of microbiology and cell science.
When babies are born, their immune systems are underdeveloped, making it hard for them to fight infections on their own. They are also often too young to respond adequately to certain types of vaccines, said Josef Neu, M.D., one of the study's co-authors and a professor in the UF College of Medicine's department of paediatrics, division of neonatology.
During this vulnerable period, breast milk allows nursing mothers to provide infants with "passive immunity," Neu explained.
"Think of breast milk as a toolbox full of all the different tools that help prepare the infant for life. Vaccination adds another tool to the toolbox, one that has the potential to be especially good at preventing COVID-19 illness," Neu said. "The results of our study strongly suggest that vaccines can help protect both mom and baby, another compelling reason for pregnant or lactating women to get vaccinated."
The study was conducted between December 2020 and March 2021, when the Pfizer and Moderna vaccines first became available to health care workers.
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