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Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research
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Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research

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SARS CoV-2 reinfection rate is higher in the Omicron variant than in the Alpha and Delta variants

Osman Özüdoğru1, Yasemin Genç Bahçe2, Ömer Acer3

  • 1Department of Internal Medicine, Medical Faculty, Siirt University, Siirt, 56100, Turkey.

Irish Journal of Medical Science
|June 17, 2022
PubMed
Abstract

Insights

The Omicron variant showed the highest SARS-CoV-2 reinfection rate, being approximately 30 times more frequent than the Alpha variant. This study highlights significant differences in reinfection frequency across major COVID-19 variants.

Area of Science:

  • Virology
  • Epidemiology
  • Infectious Diseases

Background:

  • Mutations in SARS-CoV-2 variants like Alpha and Delta are linked to immune evasion and increased transmissibility.
  • Uncertainties exist regarding the immune evasion and reinfection potential of the Omicron variant.
  • Previous variants demonstrated varying degrees of immune escape, necessitating further investigation into newer strains.

Purpose of the Study:

  • To compare the frequency of reinfection across different severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants.
  • To analyze the temporal patterns and rates of reinfection associated with Alpha, Delta, and Omicron variants.
  • To assess the clinical significance of reinfections in the context of evolving SARS-CoV-2 variants.

Main Methods:

  • Retrospective analysis of COVID-19 patient data from a single hospital.
  • Examination of reinfection rates and demographic characteristics for 27,487 patients infected with Alpha, Delta, or Omicron variants.
  • Statistical comparison of reinfection frequencies and time intervals between initial infection and reinfection.

Main Results:

  • Reinfection rates were 0.46% for Alpha, 1.16% for Delta, and 13.0% for Omicron.
  • A statistically significant difference in reinfection rates was observed among the variants (p < 0.001).
  • The mean time to reinfection was significantly longer for Omicron (361.2 days) compared to Alpha (204.4 days) and Delta (291.2 days).

Conclusions:

  • The Omicron variant exhibited the highest rate of SARS-CoV-2 reinfection.
  • Reinfection was approximately 30 times more frequent with Omicron than with Alpha and 10 times more frequent than with Delta.
  • A significant proportion of Omicron reinfections occurred over 12 months post-initial infection, indicating substantial immune evasion.
Keywords:
AlphaDeltaOmicronReinfectionVariant

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