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- W1936124037 endingPage "1768" @default.
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- W1936124037 abstract "Abstract It is commonly perceived that the human immune system is naive to the newly emerged H5N1 virus. In contrast, most adults have been exposed to influenza A H1N1 and H3N2 viruses through vaccination or infection. Adults born before 1968 have likely been exposed to H2N2 viruses. We hypothesized that CD4+ T cells generated in response to H1N1, H3N2, and H2N2 influenza A viruses also recognize H5N1 epitopes. Tetramer-guided epitope mapping and Ag-specific class II tetramers were used to identify H5N1-specific T cell epitopes and detect H5N1-specific T cell responses. Fifteen of 15 healthy subjects tested had robust CD4+ T cell responses against matrix protein, nucleoprotein, and neuraminidase of the influenza A/Viet Nam/1203/2004 (H5N1) virus. These results are not surprising, because the matrix protein and nucleoprotein of influenza A viruses are conserved while the neuraminidase of the H5N1 virus is of the same subtype as that of the circulating H1N1 influenza strain. However, H5N1 hemagglutinin-reactive CD4+ T cells were also detected in 14 of 14 subjects examined despite the fact that hemagglutinin is less conserved. Most were cross-reactive to H1, H2, or H3 hemagglutinin epitopes. H5N1-reactive T cells were also detected ex vivo, exhibited a memory phenotype, and were capable of secreting IFN-γ, TNF-α, IL-5, and IL-13. These data demonstrate the presence of H5N1 cross-reactive T cells in healthy Caucasian subjects, implying that exposure to influenza A H1N1, H3N2, or H2N2 viruses through either vaccination or infection may provide partial immunity to the H5N1 virus." @default.
- W1936124037 created "2016-06-24" @default.
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- W1936124037 date "2008-02-01" @default.
- W1936124037 modified "2023-10-17" @default.
- W1936124037 title "Healthy Human Subjects Have CD4+ T Cells Directed against H5N1 Influenza Virus" @default.
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- W1936124037 doi "https://doi.org/10.4049/jimmunol.180.3.1758" @default.
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