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Novel coronavirus disease-2019 (COVID-19) is a highly contagious respiratory-related disease induced by the newly emerged virus SARS-CoV-2. Given that inflammatory immune cells may induce severe lung injury, the involvement of immune factors in the pathogenesis of the disease cannot be overestimated. It has been demonstrated that coronaviruses (CoVs) have developed mechanisms of immune evasion, making them invisible to the immune system at an early stage of infection. The mechanism relies on inhibition of the anti-viral response of type I interferons (IFNs), which supports uncontrolled viral replication in epithelial cells. There is growing body of evidence that the fatal hyperinflammation (\'cytokine storm\') responsible for the severe course of COVID-19 is a consequence of massive SARS-CoV-2 replication rather than inappropriate hyperresponsiveness of the immune system. Therefore, a dampened innate anti-viral immune response seems to be the primary cause of the delayed critical cascade of uncontrolled immune events leading to fulminating systemic inflammation. The occurrence of virus transmission even in asymptomatic subjects infected with SARS-CoV-2 clearly strengthens the evidence for a key role of sufficient immune control of viral replication in a subset of cases (e.g. in children, a population with highly effective innate immune responses). Although administration of immunomodulatory therapeutics is recommended under certain conditions in the guidelines of COVID-19 management, controversies regarding treatment protocols in immunocompromised patients infected with SARS-CoV-2 still exist. Extended knowledge of clinicians on the dysregulated immune response, which is a driver of the COVID-19 outcome, may improve both therapeutic protocols and the prognosis of SARS-CoV-2 infected patients.
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Polish_archives_of_internal_medicine
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Dysregulation of the immune system as a driver of the critical course of the novel coronavirus disease 2019.
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