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    Area of Science:

    • Virology
    • Immunology
    • Infectious Diseases

    Background:

    • Multiple respiratory viruses can infect simultaneously or sequentially, leading to complex virus-virus interactions.
    • These interactions can be positive (additive/synergistic) or negative (antagonistic), affecting infection and replication.
    • Viral interference has been observed at cellular, host, and population levels.

    Purpose of the Study:

    • To review the mechanisms of viral interference in respiratory virus infections.
    • To highlight the role of interferon response in conferring temporary, non-specific immunity.
    • To emphasize the opportunity to study viral interactions as respiratory virus circulation resumes.

    Main Methods:

    • Evaluation of viral interference mechanisms in differentiated airway epithelial cells.
    • Studies utilizing animal models susceptible to relevant respiratory viruses.
    • Review of existing literature on viral interference and interferon pathways.

    Main Results:

    • Viral interference mechanisms are complex and can modulate subsequent viral infections.
    • The interferon response is a significant proposed mechanism for temporary, non-specific immunity.
    • Non-pharmacologic interventions during the pandemic impacted respiratory virus circulation.

    Conclusions:

    • Understanding viral interference is crucial for predicting and managing respiratory infections.
    • The lifting of sanitary restrictions presents a critical window for studying virus-virus interactions.
    • Further research is needed, particularly concerning interactions with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).