Rapid protection from COVID-19 in nonhuman primates vaccinated intramuscularly but not intranasally with a single dose of a recombinant vaccine

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Abstract

The ongoing pandemic of Coronavirus disease 2019 (COVID-19) continues to exert a significant burden on health care systems worldwide. With limited treatments available, vaccination remains an effective strategy to counter transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Recent discussions concerning vaccination strategies have focused on identifying vaccine platforms, number of doses, route of administration, and time to reach peak immunity against SARS-CoV-2. Here, we generated a single dose, fast-acting vesicular stomatitis virus-based vaccine derived from the licensed Ebola virus (EBOV) vaccine rVSV-ZEBOV, expressing the SARS-CoV-2 spike protein and the EBOV glycoprotein (VSV-SARS2-EBOV). Rhesus macaques vaccinated intramuscularly (IM) with a single dose of VSV-SARS2-EBOV were protected within 10 days and did not show signs of COVID-19 pneumonia. In contrast, intranasal (IN) vaccination resulted in limited immunogenicity and enhanced COVID-19 pneumonia compared to control animals. While IM and IN vaccination both induced neutralizing antibody titers, only IM vaccination resulted in a significant cellular immune response. RNA sequencing data bolstered these results by revealing robust activation of the innate and adaptive immune transcriptional signatures in the lungs of IM-vaccinated animals only. Overall, the data demonstrates that VSV-SARS2-EBOV is a potent single-dose COVID-19 vaccine candidate that offers rapid protection based on the protective efficacy observed in our study.

One sentence summary

VSV vaccine protects NHPs from COVID-19 in 10 days

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  1. SciScore for 10.1101/2021.01.19.426885: (What is this?)

    Please note, not all rigor criteria are appropriate for all manuscripts.

    Table 1: Rigor

    Institutional Review Board StatementIACUC: All procedures followed standard operating procedures (SOPs) approved by the RML Institutional Biosafety Committee (
    RandomizationThe NHPs were randomly selected for two vaccine groups (n=6) and one control group (n=4).
    Blindingnot detected.
    Power Analysisnot detected.
    Sex as a biological variableAnimal study: Sixteen female rhesus macaques (3.5-10 years of age; 4.5-10kg, Indian-origin) were used in this study.
    Cell Line Authenticationnot detected.

    Table 2: Resources

    Antibodies
    SentencesResources
    After horse-radish peroxidase (HRP)-labeled secondary antibody staining using either anti-mouse IgG (1:10,000) or anti-rabbit IgG (1:5000) (Jackson ImmunoResearch), the blots were imaged using the SuperSignal West Pico chemiluminescent substrate (Thermo Fisher Scientific) and an iBright™ CL1500 Imaging System (Thermo Fisher Scientific)
    anti-mouse IgG
    suggested: (LSBio (LifeSpan Cat# LS-C69682-5000, RRID:AB_1653096)
    anti-rabbit IgG
    suggested: None
    After 3 washes with PBST, the bound antibodies were labeled using 50 μl of 1:2,500 horse-radish peroxidase (HRP)-labeled anti-monkey IgG (H+L) (SeraCare Life Sciences) diluted in 1% skim milk in PBST.
    anti-monkey IgG
    suggested: None
    Specific anti-CoV immunoreactivity was detected using an in-house SARS-CoV-2 nucleocapsid protein (U864YFA140-4/CB2093) rabbit antibody (Genscript) at a 1:1000 dilution.
    SARS-CoV-2 nucleocapsid protein ( U864YFA140-4/CB2093 )
    suggested: None
    Experimental Models: Cell Lines
    SentencesResources
    Cells and Viruses: Huh7 and VeroE6 cells were grown at 37°C and 5% CO2 in Dulbecco’s modified Eagle’s medium (DMEM) (Sigma-Aldrich, St. Louis, MO) containing 10% fetal bovine serum (FBS) (Wisent Inc., St. Bruno, Canada), 2 mM L-glutamine (Thermo Fisher Scientific, Waltham, MA), 50 U/mL penicillin (Thermo Fisher Scientific), and 50 μg/mL streptomycin (Thermo Fisher Scientific).
    Huh7
    suggested: None
    The replication-competent recombinant VSV was recovered in BHK-T7 cells as described previously (26).
    BHK-T7
    suggested: None
    Finally, media was removed from cells and the mixture was added to VeroE6 cells and incubated at 37°C and 5% CO2 for 6 days.
    VeroE6
    suggested: JCRB Cat# JCRB1819, RRID:CVCL_YQ49)
    Software and Algorithms
    SentencesResources
    Sample acquisition was performed on a Cytoflex-S (Beckman Coulter) and data analyzed in FlowJo V10 (TreeStar).
    FlowJo
    suggested: (FlowJo, RRID:SCR_008520)
    RNA-Seq reads were demultiplexed, quality-filtered and trimmed using Trim Galore (average Phred score cut-off of 30, minimum length of 50 bp).
    Trim Galore
    suggested: (Trim Galore, RRID:SCR_011847)
    FastQC was used to generate quality reports.
    FastQC
    suggested: (FastQC, RRID:SCR_014583)
    Hisat2 was used to align reads to the reference genome Macaca mulatta (Macaca_mulatta.Mmul_8.0.1.dna.toplevel.fa) and the Macaca_mulatta.Mmul_8.0.1.97.gtf was used for annotation.
    Hisat2
    suggested: (HISAT2, RRID:SCR_015530)
    Raw expression values (gene-level read counts) were generated using the summarizeOverlaps function and normalized (read per kilobase of transcript per million mapped reads, rpkm) using the edgeR package.
    edgeR
    suggested: (edgeR, RRID:SCR_012802)
    Functional enrichment of DEGs was performed using Metascape to identify relevant Gene Ontology (GO) biological process terms and KEGG pathways.
    Metascape
    suggested: (Metascape, RRID:SCR_016620)
    KEGG
    suggested: (KEGG, RRID:SCR_012773)
    In silico flow cytometry was performed using ImmQuant with the IRIS database.
    IRIS
    suggested: None
    , Venn diagrams and violin plots were generated using R packages ggplot2 and VennDiagrams.
    ggplot2
    suggested: (ggplot2, RRID:SCR_014601)
    GO network plots were generated in Cytoscape (Version 3.5.1).
    Cytoscape
    suggested: (Cytoscape, RRID:SCR_003032)
    Graphs were generated using GraphPad Prism software (version 8).
    GraphPad Prism
    suggested: (GraphPad Prism, RRID:SCR_002798)
    Statistical analyses: All statistical analysis was performed in Prism 8 (GraphPad).
    GraphPad
    suggested: (GraphPad Prism, RRID:SCR_002798)

    Results from OddPub: We did not detect open data. We also did not detect open code. Researchers are encouraged to share open data when possible (see Nature blog).


    Results from LimitationRecognizer: An explicit section about the limitations of the techniques employed in this study was not found. We encourage authors to address study limitations.

    Results from TrialIdentifier: No clinical trial numbers were referenced.


    Results from Barzooka: We did not find any issues relating to the usage of bar graphs.


    Results from JetFighter: We did not find any issues relating to colormaps.


    Results from rtransparent:
    • Thank you for including a conflict of interest statement. Authors are encouraged to include this statement when submitting to a journal.
    • Thank you for including a funding statement. Authors are encouraged to include this statement when submitting to a journal.
    • No protocol registration statement was detected.

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