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Vaccine mRNA contaminates breast milk

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Biodistribution of mRNA COVID-19 vaccines in human breast milk https://www.thelancet.com/journals/ebiom/article/PIIS2352-3964(23)00366-3/fulltext Background Several vulnerable groups, such as pregnant and lactating women, have been excluded from the initial vaccine clinical trials. The possible passage of the vaccine mRNA to breast milk (BM), resulting in neonatal exposure, was not investigated. As a result, limited research has been conducted on the systemic distribution of vaccine mRNA during lactation, and whether it is excreted in human breast milk (BM). We evaluated if COVID-19 vaccine mRNA is detectable in breast milk after maternal vaccination, and determined its potential translational activity. Methods We collected breast milk samples from 13 lactating, healthy, post-partum women before and after COVID-19 mRNA vaccination. Vaccine mRNA in whole breast milk and BM extracellular vesicles (EVs) assayed using quantitative Droplet Digital PCR, and its integrity and translational activity were evaluated. Findings Of 13 lactating women receiving the vaccine (20 exposures), trace mRNA amounts were detected in 10 exposures, up to 45 hours post-vaccination. The mRNA was concentrated in the breast milk extracellular vesicles (EVs); This can be significant as the breast milk extracellular vesicles act as natural LNPs, protecting the mRNA from degradation. Milk-derived EVs are resistant to proteolysis by gastric and pancreatic secretions and can be readily absorbed by intestinal epithelial cells However, these EVs neither expressed SARS-COV-2 spike protein, nor induced its expression in the HT-29 cell line. However, positive control samples used in concentrations similar to those of BM EVs also failed to induce S protein expression. Vaccine mRNA integrity was reduced to 12–25% in BM. Interpretation Our findings demonstrate that the COVID-19 vaccine mRNA is not confined to the injection site, but spreads systemically and is packaged into BM EVs. We believe breastfeeding post-vaccination is safe, especially 48 h after vaccination. Further investigation is required to determine the minimum amount of mRNA needed to elicit an immune response in newborns Nevertheless, since the minimum mRNA vaccine dose to elicit an immune reaction in infants less than 6 months is unknown, a dialogue between a breastfeeding mother and her healthcare provider should address the benefit/risk considerations of breastfeeding in the first two days after maternal vaccination. Funding Department of Pediatrics, NYU-Grossman Long Island School of Medicine. More detail The mRNA COVID-19 vaccines comprise lipid nanoparticles (LNPs) that contain mRNA coding the SARS-CoV-2 S protein as the active component. Relatively little has been reported on the tissue localization of the LNPs after intramuscular administration of the vaccine. Following intramuscular administration, the vaccine LNPs were rapidly disseminated to several organs Potential translational activity were not evaluated.

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