The breast milk of mothers who have had Covid-19 vaccines contains a significant level of antibodies that may help protect nursing babies from the virus, a small study suggests.
When babies are born, their underdeveloped immune systems make it hard for them to fight infections on their own.
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They are also often too young to respond adequately to certain types of vaccines, experts say.
For this study researchers recruited 21 lactating healthcare workers who had never contracted the virus.
They sampled the mothers' breast milk and blood three times - before vaccination, after the first dose and after the second dose.
There was a robust antibody response in blood and breast milk after the second dose - about a hundred-fold increase compared with levels before vaccination - the study found.
Joseph Larkin III, senior author of the study and an associate professor at the University of Florida, said: "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."