PreprintCited by 514SARS-CoV-2 and COVID-19 ResearchCOVID-19 epidemiological studiesCOVID-19 Clinical Research Studies

Decreased SARS-CoV-2 viral load following vaccination

Open access
Levine-Tiefenbrun, Matan, Yelin, Idan, Katz, Rachel, Herzel, Esma, Golan, Ziv, Schreiber, Licita, Wolf, Tamar, Nadler, Varda +6 more·2021·Nature Medicine

Preprint — published as 10.1038/s41591-021-01316-7 · Paper page

Abstract

Beyond their substantial protection of individual vaccinees, it is hoped that the COVID-19 vaccines would reduce viral load in breakthrough infections thereby further suppress onward transmission. Here, analyzing positive SARS-CoV-2 test results following inoculation with the BNT162b2 mRNA vaccine, we find that the viral load is reduced 4-fold for infections occurring 12-28 days after the first dose of vaccine. These reduced viral loads hint to lower infectiousness, further contributing to vaccine impact on virus spread.

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Crossref · 10.1101/2021.02.06.21251283

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  • Early post-implementation analyses suggest mRNA vaccines reduce asymptomatic infection incidence and nasopharyngeal viral load in people infected despite vaccination.

    “Some early post-implementation analyses have suggested that the mRNA vaccines also reduce the incidence of asymptomatic infection and the nasopharyngeal viral load in individuals who become infected despite the vaccination93,107, but it is yet unclear how this translates to risk of transmission.”

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Cites

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2 of the 16 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. Chodcik, G. et al. The effectiveness of the first dose of BNT162 b 2 vaccine in reducing SARS-CoV-2 infection 13-24 days after immunization: real-world evidence. medRxiv 2021.01.27.21250612 (2021).
  2. Levine-Tiefenbrun, M. et al. Association of COVID-19 RT-qPCR test false-negative rate with patient age, sex and time since diagnosis. medRxiv (2020).

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Authors
Levine-Tiefenbrun, M., Yelin, I., Katz, R., Herzel, E., Golan, Z., Schreiber, L., Wolf, T., Nadler, V., Ben-Tov, A., Kuint, J., Gazit, S., Patalon, T., Chodick, G., & Kishony, R.
Affiliations
  • Technion – Israel Institute of Technology (IL)
  • Maccabi Healthcare Services (IL)
  • Tel Aviv University (IL)
Corresponding author
  • Yelin, Idan
  • Kishony, Roy
Venue
Nature Medicine
Publisher
openRxiv
Published
2021-02-08
Volume
27
Issue
5
Pages
790-792
ISSN
1078-8956 (ISSN-L)
OpenAlex
W3150351745
Cited by
514
References
16
Citations by year
2026: 4 · 2025: 12 · 2024: 19 · 2023: 67 · 2022: 166 · 2021: 242 · 2020: 4
FWCI
39.10
Type
journal article
Language
en
Open access
Locations
  • Nature Medicine (publishedVersion)
  • medRxiv (acceptedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Funders
Israel Science Foundation (3633/19)
Topics
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
  • Physical Sciences › Mathematics › Modeling and Simulation › COVID-19 epidemiological studies
  • Health Sciences › Medicine › Infectious Diseases › COVID-19 Clinical Research Studies
Keywords
SARS-CoV-2, COVID-19 pandemic, BNT162b2, mRNA vaccines, breakthrough infection, viral load, infectiousness, transmission reduction, vaccine effectiveness, real-world data
MeSH terms
COVID-19, SARS-CoV-2, COVID-19 Vaccines, BNT162 Vaccine, Adolescent, Adult, Aged, Aged, 80 and over, Female, Humans, Male, Middle Aged, Vaccination, Viral Load, Young Adult

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