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Newborns' passive humoral SARS-CoV-2 immunity following heterologous vaccination of the mother during pregnancy

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Summary: This study examined the serologic response in pregnant women to SARS-CoV-2 and explored its correlation with maternal clinical presentation as well as the passive immunity received by neonates. The results showed that maternal serologies were correlated with symptomatic maternal infection, and higher levels of maternal antibodies were associated with passive neonatal immunity.

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Summary: The study found that pregnant and lactating women had equivalent antibody titers after receiving the coronavirus disease 2019 mRNA vaccine compared to nonpregnant women, and these titers were higher than those induced by natural infection. Vaccine-induced antibodies were present in umbilical cord blood and breastmilk samples, transferring immunity to neonates through placenta and breastmilk.

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Safety and immunogenicity of heterologous versus homologous prime-boost schedules with an adenoviral vectored and mRNA COVID-19 vaccine (Com-COV): a single-blind, randomised, non-inferiority trial

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Summary: Heterologous prime-boost COVID-19 vaccine schedules could facilitate mass immunisation, with ChAd/BNT showing non-inferior immunogenicity compared to ChAd/ChAd, but BNT/ChAd did not demonstrate non-inferiority to BNT/BNT. The results support flexibility in using heterologous prime-boost vaccination with ChAd and BNT COVID-19 vaccines.

LANCET (2021)