No vertical—mom-to-baby—transmission of SARS-CoV-2, the virus that causes COVID-19, occurred in a study of 64 pregnant women with confirmed COVID, reports a study yesterday in JAMA Network Open.

While placental positioning of the angiotensin-converting enzyme 2 (ACE2) and transmembrane serine protease 2 (TMPRSS2) receptors—two main ways SARS-CoV-2 enters cells—may provide fetal protection in utero, the researchers found unexpectedly low transference of SARS-CoV-2 antibodies from mother to child.

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