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Mapping SARS-CoV-2 antigenic relationships and serological responses.

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SARS-CoV-2 variants challenge immunity, leading to reinfections. Antigenic cartography reveals key spike protein changes driving these differences, impacting vaccine effectiveness over time.

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Area of Science:

  • Immunology
  • Virology
  • Genetics

Background:

  • The emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants has led to immune escape and reinfections.
  • Understanding the antigenic properties of these variants is crucial for public health strategies.

Purpose of the Study:

  • To analyze cross-reactivity patterns between SARS-CoV-2 variants and human sera.
  • To investigate the impact of variant evolution and vaccination on immune responses.

Main Methods:

  • Antigenic cartography was employed to map antigenic relationships.
  • Analysis included 21 SARS-CoV-2 variants and sera from individuals with prior infection or mRNA vaccination.

Main Results:

  • Pre-Omicron variants showed antigenic differences attributed to spike protein substitutions (positions 417, 452, 484, 501).
  • Immune response breadth increased significantly between 4 weeks and over 3 months post-second vaccine dose.
  • Immunodominance of spike regions varied based on initial variant exposure.

Conclusions:

  • Spike protein mutations significantly alter SARS-CoV-2 antigenicity, influencing cross-reactivity.
  • Vaccination timing and prior infection history impact the breadth and specificity of immune responses.
  • Findings have implications for variant risk assessment and optimizing vaccine strain selection.