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Insights into the virologic and immunologic features of SARS-COV-2

Journal

WORLD JOURNAL OF CLINICAL CASES
Volume 9, Issue 19, Pages 5007-5018

Publisher

BAISHIDENG PUBLISHING GROUP INC
DOI: 10.12998/wjcc.v9.i19.5007

Keywords

SARS-CoV-2; Immune response; Neutralizing antibodies; Spike protein

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The host immune system plays a crucial role in the clinical course and prognosis of COVID-19, with high neutralizing antibodies and a balanced T cell response being key for optimal immunity. Innate and mucosal defenses also contribute significantly, and immunological memory is maintained for long periods.
The host immunity is crucial in determining the clinical course and prognosis of coronavirus disease 2019, where some systemic and severe manifestations are associated with excessive or suboptimal responses. Several antigenic epitopes in spike, nucleocapsid and membrane proteins of severe acute respiratory syndrome coronavirus 2 are targeted by the immune system, and a robust response with innate and adaptive components develops in infected individuals. High titer neutralizing antibodies and a balanced T cell response appears to constitute the optimal immune response to severe acute respiratory syndrome coronavirus 2, where innate and mucosal defenses also contribute significantly. Following exposure, immunological memory seems to develop and be maintained for substantial periods. Here, we provide an overview of the main aspects in antiviral immunity involving innate and adaptive responses with insights into virus structure, individual variations pertaining to disease severity as well as long-term protective immunity expected to be attained by vaccination.

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