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Related Concept Videos

Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
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Coronavirus

Coronaviruses, including the severe acute respiratory syndrome coronavirus (SARS-CoV), are enveloped viruses characterized by their single-stranded, positive-sense RNA genome and helical nucleocapsid structure. The hallmark of these viruses is their club-shaped spike (S) glycoproteins that protrude from the viral envelope, facilitating attachment to host cells. Typically, coronaviruses infect the upper respiratory tract, often causing mild or asymptomatic disease. However, certain strains like...
Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...

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Related Experiment Video

Updated: Jul 12, 2026

Infection of Primary Nasal Epithelial Cells Grown at an Air-Liquid Interface to Characterize Human Coronavirus-Host Interactions
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Published on: September 22, 2023

Early Mucosal Type II Interferon Limits SARS-CoV-2 Replication in Humans.

Alexander Viloria Winnett, Alexandra Tabachnikova, Jonathan Chen

    Medrxiv : the Preprint Server for Health Sciences
    |July 10, 2026
    PubMed
    Summary

    Prior COVID-19 vaccination primes early mucosal Type II Interferon (IFN) responses, mediated by tissue-resident memory T cells (T RM), to limit SARS-CoV-2 replication. This vaccination-induced immunity complements humoral responses, enhancing early antiviral defense in the upper respiratory tract.

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    Area of Science:

    • Immunology
    • Virology
    • Vaccinology

    Background:

    • COVID-19 vaccines reduce disease severity but have limited impact on infection and transmission.
    • Understanding early mucosal immune responses is crucial for developing effective antiviral strategies against SARS-CoV-2.
    • Longitudinal, paired-site sampling is needed to resolve early upper respiratory antiviral dynamics.

    Purpose of the Study:

    • To investigate the temporal and anatomical dynamics of early mucosal immune responses following naturally acquired SARS-CoV-2 infection.
    • To determine the impact of prior COVID-19 vaccination on these early mucosal immune responses.
    • To identify mucosal immune correlates associated with reduced viral replication.

    Main Methods:

    • Prospective collection of daily samples from nasal, oral, and oropharyngeal sites of infected and uninfected individuals.
    • Quantification of viral load using RT-qPCR and gene expression analysis via mRNA sequencing.
    • Analysis of Type I and Type II Interferon (IFN) responses and tissue-resident memory T cell (T RM) signatures.

    Main Results:

    • Type I IFN responses were initiated concurrently across upper respiratory sites before local viral detection.
    • Type II IFN initiation was spatially variable, with earlier initiation in the nasal cavity linked to prior vaccination, higher T RM signatures, and reduced viral replication.
    • Prior vaccination primes rapid, inducible mucosal Type II IFN responses, likely mediated by T RM cells.

    Conclusions:

    • Early mucosal Type II IFN responses, enhanced by prior COVID-19 vaccination and T RM cells, play a significant role in limiting SARS-CoV-2 replication.
    • These findings highlight the importance of mucosal immunity beyond humoral responses in controlling early viral infection.
    • The study provides insights into developing improved antiviral strategies targeting early mucosal immune responses.