Assessment of SARS-CoV-2 neutralizing antibody titers in breastmilk from convalescent and vaccinated mothers

Breastmilk contains antibodies that could protect breastfed infants from infections. In this work, we examined if antibodies in breastmilk could neutralize SARS-CoV-2 in 84 breastmilk samples from women that were either vaccinated (Comirnaty, mRNA-1273, or ChAdOx1), infected with SARS-CoV-2, or both infected and vaccinated. The neutralization capacity of these sera was tested using pseudotyped vesicular stomatitis virus carrying either the Wuhan-Hu-1, Delta, or BA.1 Omicron spike proteins. We found that natural infection resulted in higher neutralizing titers and that neutralization correlated positively with levels of immunoglobulin A in breastmilk. In addition, significant differences in the capacity to produce neutralizing antibodies were observed between both mRNA-based vaccines and the adenovirus-vectored ChAdOx1 COVID-19 vaccine. Overall, our results indicate that breastmilk from naturally infected women or those vaccinated with mRNA-based vaccines contains SARS-CoV-2 neutralizing antibodies that could potentially provide protection to breastfed infants from infection.

Bibliographic Details

Main Authors:	Bäuerl, Christine, Zulaica, Joao, Rusu, Luciana, Moreno, Alicia Rodríguez, Pérez Cano, Francisco J., Lerin, Carles, Mena Tudela, Desirée, Aguilar Camprubí, Laia, Parra Llorca, Anna, Martínez-Costa, Cecilia, Geller, Ron, Collado, María Carmen
Other Authors:	European Commission
Format:	artículo biblioteca
Language:	English
Published:	Elsevier 2023-05-04
Subjects:	Health sciences, Immune response, Public health, Virology, http://metadata.un.org/sdg/3, Ensure healthy lives and promote well-being for all at all ages,
Online Access:	http://hdl.handle.net/10261/309716 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100011033 https://api.elsevier.com/content/abstract/scopus_id/85159292872
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