The researchers found that pregnant people who received the COVID-19 vaccines generated antibodies against specific types of SARS-CoV-2. These included antibodies against the D614G variant (which the vaccines were designed to protect against), as well as the Delta and Omicron subvariants. The antibodies effectively crossed the placenta and were also found in the cord blood of vaccinated participants. This likely conferred some protection in the newborns against these variants immediately after birth—a critical time when they are vulnerable to severe COVID-19 disease but are too young to be vaccinated, according to the researchers.
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