
The complexity of SARS-CoV-2 immune responses has grown with time, especially in vaccinated individuals. Research involving 1,325 individuals, including 955 with no prior infections, investigated immune responses before and after three doses of the BNT162b2 vaccine in the context of the Omicron variant. Results reveal that individuals with previous SARS-CoV-2 infection had stronger humoral and cellular responses post-vaccination, with robust IgA responses linked to prior viral exposure. Lower IgG, IgA, and neutralizing antibody levels post-vaccination increased the risk of reinfection and future Omicron infections. Immune imprinting played a role, emphasizing the importance of hybrid immunity for strong immune responses.
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