Hybrid immunity and vaccine Imprinting: Powerful defenses against Omicron reinfection HybridImmunity VaccineImprinting Omicron Reinfection Immunological Study LongTermProtection ResearchSquare
By Dr. Priyom Bose, Ph.D.Jun 25 2023Reviewed by Benedette Cuffari, M.Sc. To date, the ongoing coronavirus disease 2019 pandemic, caused by the severe acute respiratory syndrome coronavirus-2 , has claimed more than 6.94 million lives worldwide.
The abrupt withdrawal of COVID-19 booster recommendations could also be due to incomplete evidence regarding the persistence and effectiveness of natural infection-elicited immune protection against re-infection caused by emerging variants with different antigenic characteristics. About the study The Hubei province of China, which was the main epicenter of the first COVID-19 outbreak in the world, successfully avoided all pre-Omicron variants due to the implementation of strict public health measures. Most people in Hubei were vaccinated with several rounds of WH1-based COVID-19 vaccines; therefore, the majority of this population was exclusively WH1 imprinted.
Other cohorts from the same region were studied. One cohort included vaccinated participants, whereas another cohort contained unvaccinated participants. Mechanistically, antibody feedback limited the magnitude of WH1 back-boost through antibody diversity enhancement. In addition, antigenic seniority caused a rapid upregulation of Omicron neutralization titers by recalling cross-reactive B-cells upon Omicron infection.
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