BERKHOFF EG, Geelhoed-Mieras MM, Jonges M, Smith D. An amino acid substitution in the influenza A virus hemagglutinin associated with escape from recognition by human virus-specific CD4(+) T-cells. Virus Res. 2007 Apr 7
Influenza virus-specific CD4(+) T-helper cells were cloned that recognized a virus strain isolated in 1981, but that failed to recognize more recent strains. The HLA-DR*1601-restricted epitope recognized was located in the hemagglutinin (HA(99-113)) and the naturally occurring A-->V substitution at position 106 was responsible for abrogating the recognition by HA(99-113)-specific CD4(+) T-cells. This amino acid substitution was found in influenza A/H3N2 viruses that circulated between 1999 and 2005 and did not affect recognition by virus-specific antibodies. It was speculated that influenza viruses could evade recognition by virus-specific CD4(+) T-cells, at least temporarily.
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