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Study Links T Cell Response to COVID-19 Risk After Boosters

A new study reveals that specific T cell responses correlate with a reduced risk of COVID-19 following a second booster vaccine, particularly in individuals previously infected with SARS-CoV-2.

News AutomationCompiled 01:07 UTC · 1 min read

A microscopic view of T cells, crucial components of the immune system.

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Abstract

The relationship between SARS-CoV-2-specific T cell responses and COVID-19 risk is incompletely understood, particularly after variant-adapted booster receipt. We assessed Spike-specific and Nucleocapsid-specific CD4+ and CD8+ T cell responses, measured by validated 27-color intracellular cytokine staining assay, as correlates of COVID-19 risk over 6 months in COVAIL recipients of a second SARS-CoV-2 booster on Day 1 (D1). Among one-dose mRNA recipients, D15 CD4 + T cell IFN-γ and/or IL-2 Spike BA.4/5 responses correlated inversely with COVID-19 risk for previously-infected (non-naïve) [hazard ratio (HR) = 0.62 (95% CI 0.39, 0.99) per 3-fold increase], but not SARS-CoV-2 naïve [HR = 1.03 (0.81, 1.32)], participants (22 non-naïve, 122 naïve cases). Spike-specific CD4+ T cells and neutralizing antibodies each independently predicted COVID-19 in non-naïve participants Cox bivariate model HRs per standard deviation: D1 Spike CD4 + T cell 0.81 (0.68, 0.96), D15 titer 0.43 (0.27, 0.69), co-correlate p )

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Zhang, B., Fong, Y., Yu, C. et al. Distinct T cell correlates of COVID-19 risk before and after a second booster in previously SARS-CoV-2 infected versus naïve COVAIL trial participants. Nat Commun (2026). https://doi.org/10.1038/s41467-026-78444-6

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