Pre-existing T cell immunity determines the frequency and magnitude of cellular immune response to two doses of mRNA vaccine against SARS-CoV-2

Vaccine: X(2022)

Cited 9|Views2
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Abstract
•Lack of CD4 T-cell response to first/second dose of mRNA vaccine was observed in 21% and 12% of health care workers (HCWs).•T-cell response was greater in frequency/magnitude in HCWs with pre-existing immunity, due due to infection or cross-reactivity.•Pre-existing immunity correlated with the magnitude of specific antibodies production after vaccination.
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Key words
SARS-CoV-2 humoral response,Cellular response,mRNA vaccine,Pre-existing immunity
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