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Factors associated with vaccine-induced T cell immune responses against SARS-CoV-2 in kidney transplant recipients.
Journal of Infectious Diseases 2022 November 22
Vaccination against SARS-CoV-2 is an important prophylactic measure in kidney transplant recipients (KTRs), however, the immune response is often impaired. Here, we examined the T cell immune response against SARS-CoV-2 in 148 KTRs after three or four vaccine doses including 35 KTRs with subsequent SARS-CoV-2 infection. The frequency of spike-specific T cells was lower in KTRs compared to immunocompetent controls and correlated with the level of spike-specific antibodies. Positive predictors for detection of vaccine-induced T cells were detection of spike-specific antibodies, heterologous immunization with mRNA and a vector vaccine and longer time past transplant. In vaccinated KTRs with subsequent SARS-CoV-2 infection, the T-cell response was greatly enhanced and was significantly higher than in vaccinated KTRs without SARS-CoV-2 infection. Overall, the data show a correlation between impaired humoral and T-cell immunity to SARS-CoV-2 vaccination and provide evidence for greater robustness of hybrid immunity in KTRs.
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