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Functional Antibodies Against SARS-CoV-2 Receptor Binding Domain Variants with Mutations N501Y or E484K in Human Milk from COVID-19-Vaccinated, -Recovered, and -Unvaccinated Women.
Demers-Mathieu, Veronique; Hakansson, Anders P; Hall, Stephanie; Lavangnananda, Sirima; Fels, Shawn; Medo, Elena.
  • Demers-Mathieu V; Department of Neonatal Immunology and Microbiology, Medolac Laboratories A Public Benefit Corporation, Boulder City, Nevada, USA.
  • Hakansson AP; Division of Experimental Infection Medicine, Department of Translational Medicine, Faculty of Medicine, Lund University, Malmo, Sweden.
  • Hall S; Department of Neonatal Immunology and Microbiology, Medolac Laboratories A Public Benefit Corporation, Boulder City, Nevada, USA.
  • Lavangnananda S; Department of Neonatal Immunology and Microbiology, Medolac Laboratories A Public Benefit Corporation, Boulder City, Nevada, USA.
  • Fels S; Department of Neonatal Immunology and Microbiology, Medolac Laboratories A Public Benefit Corporation, Boulder City, Nevada, USA.
  • Medo E; Department of Neonatal Immunology and Microbiology, Medolac Laboratories A Public Benefit Corporation, Boulder City, Nevada, USA.
Breastfeed Med ; 17(2): 163-172, 2022 02.
Article in English | MEDLINE | ID: covidwho-1528149
ABSTRACT

Background:

New variants are evolving in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and receptor binding domain (RBD) mutations have been associated with a higher capacity to evade neutralizing antibodies (NAbs). We aimed at determining the impact of COVID-19 vaccine and infection on human milk antibody titers and activity against the RBD mutations from SARS-CoV-2 variants of concern. Materials and

Methods:

Milk samples were collected from 19 COVID-19 vaccinated women, 10 women who had a positive COVID-19 PCR test, and 13 unvaccinated women. The titers and NAbs of secretory IgA (SIgA)/IgA, secretory IgM (IgM)/IgM, and IgG against SARS-CoV-2 RBD with mutations N501Y or E484K were measured by using ELISA and a surrogate virus neutralization assay.

Results:

The titers of human milk IgG against N501Y were higher in the COVID-19 vaccine group than in the no-vaccine group but comparable with the COVID-19 PCR group. Other antibody titers did not differ between the three groups. The titers of SIgA/IgA were higher than those of SIgM/IgM and IgG in all three groups. The titers of SIgM/IgM and the inhibition of NAbs were higher against the mutation E484K than N501Y. Milk NAb did not differ between the three groups, but the inhibition of NAb against binding of the two mutant RBD proteins to their receptor was higher in the COVID-19 vaccine and PCR groups than in milk from prepandemic women.

Conclusions:

COVID-19 vaccination and exposure of mothers to SARS-CoV-2 influenced the titers and NAbs in breast milk against the variants of concern.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Spike Glycoprotein, Coronavirus / SARS-CoV-2 / COVID-19 / Milk, Human / Antibodies, Viral Type of study: Experimental Studies / Randomized controlled trials Topics: Vaccines / Variants Limits: Female / Humans Language: English Journal: Breastfeed Med Journal subject: Nutritional Sciences Year: 2022 Document Type: Article Affiliation country: Bfm.2021.0232

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Spike Glycoprotein, Coronavirus / SARS-CoV-2 / COVID-19 / Milk, Human / Antibodies, Viral Type of study: Experimental Studies / Randomized controlled trials Topics: Vaccines / Variants Limits: Female / Humans Language: English Journal: Breastfeed Med Journal subject: Nutritional Sciences Year: 2022 Document Type: Article Affiliation country: Bfm.2021.0232