A Baby Girl Born To a Partially Vaccinated Healthcare Worker
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A baby girl born three weeks after her mom got the first dose of Moderna's COVID-19 vaccine has antibodies against the virus. After getting the shot, the mom developed COVID-19 antibodies. Testing revealed those antibodies passed through the placenta to offer some potential protection to her future child.

While past reports have shown how moms who've had COVID-19 can deliver babies with antibodies, the authors believe theirs is the first to record how vaccines during pregnancy may do the same. Authors called their report a lucky opportunity study, since they were able to find, and follow, a pregnant person who never tested positive for COVID but got the vaccine late in pregnancy and early in the rollout.

When the baby was born, the doctors tested her cord blood for antibodies made from the vaccine, along with conducting other typical tests like for blood type. They were able to detect COVID-19 IgG antibodies, suggesting the baby has some protection against the virus, though how much or how long it lasts isn't clear.

Future research should illuminate if there's an ideal time for a pregnant person to get vaccinated to maximize protection against the virus for her child. The authors say their results were expected based on what's known about how the vaccine and others recommended during pregnancy like the flu vaccine, work.

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