Abstract
In this brief opinion piece, we highlight our studies characterizing adaptive SARS-CoV-2 immune responses in infection and vaccination, and the ability of SARS-CoV-2-specific T cells to recognize emerging variants of concern, and the role of pre-existing cross-reactive T cells. In the context of the debate on correlates of protection, the pandemic's progression in the past 3 years underlined the need to consider how different adaptive immune responses might differentially contribute to protection from SARS-CoV-2 infection versus COVID-19 disease. Lastly, we discuss how cross-reactive T cell responses may be useful in generating a broad adaptive immunity, recognizing different variants and viral families. Considering vaccines with broadly conserved antigens could improve preparedness for future infectious disease outbreaks.
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