What question did this study set out to answer?

To determine the presence, age-related prevalence, and functional role of preexisting endemic coronavirus-reactive CD4+ T cells during SARS-CoV-2 infection and vaccination.

August 31, 2021ScienceOpen Access

Cross-reactive CD4 ⁺ T cells enhance SARS-CoV-2 immune responses upon infection and vaccination

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To determine the presence, age-related prevalence, and functional role of preexisting endemic coronavirus-reactive CD4+ T cells during SARS-CoV-2 infection and vaccination.
Assessed the frequency and age-associated dynamics of human endemic coronavirus- and SARS-CoV-2-cross-reactive CD4+ T cells.
Identified conserved immunodominant target epitopes and tracked cross-reactive T cell kinetics and anti-SARS-CoV-2-S1-IgG correlations following infection and primary BNT162b2 mRNA vaccination.
Cross-reactive CD4+ T cells targeting a universal coronavirus spike epitope (S816-830) were ubiquitous across individuals but significantly decreased with older age.
Preexisting cross-reactive T cells were mobilized upon SARS-CoV-2 infection, with frequencies positively correlating with anti-S1-IgG antibody titers, and showed rapid secondary-response activation kinetics following initial BNT162b2 vaccination.

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Implication

Immunological study demonstrates that preexisting cross-reactive CD4 T cells enhance SARS-CoV-2 immune responses, suggesting a mechanism for rapid protection and mild COVID-19.

Cite This Study

Loyal et al. (2021) studied this question.

synapsesocial.com/papers/69dbca683d9adb00e768517b https://doi.org/10.1126/science.abh1823

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Implication

Immunological study demonstrates that preexisting cross-reactive CD4 T cells enhance SARS-CoV-2 immune responses, suggesting a mechanism for rapid protection and mild COVID-19.

Cross-reactive CD4 ⁺ T cells enhance SARS-CoV-2 immune responses upon infection and vaccination

Key Points

Discussion

Implication

Cite This Study

Cross-reactive CD4 ⁺ T cells enhance SARS-CoV-2 immune responses upon infection and vaccination

Key Points

Discussion

Implication

Cite This Study

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