Childhood immunological imprinting of cross-subtype antibodies targeting the hemagglutinin head domain of influenza viruses
Li, S. H.; Wang, B.; Jo, G.; Mikelov, A.; Atkinson, R. K.; Le Sage, V.; Furey, C.; Ort, J. T.; Ye, N.; Roltgen, K.; Joshi, S. A.; Lee, J.-Y.; Pursell, T. A.; Drapeau, E. M.; Han, J.; Callear, A. P.; Collman, R. G.; Monto, A. S.; Martin, E. T.; Lakdawala, S. S.; Ward, A. B.; Wilson, I. A.; Boyd, S. D.; Hensley, S. E.
Show abstract
Influenza virus cross-subtype antibodies targeting the hemagglutinin (HA) head are rare. Here, we found that a large proportion of monoclonal antibodies (mAbs) isolated from individuals immunized with the 2021-22 seasonal influenza vaccine bound to an epitope on the HA head of both the H1N1 vaccine strain and H3N2 strains from the mid-1990s. These H1/H3 cross-reactive antibodies were also found in polyclonal sera, but only in samples from individuals born in the 1990s. Ferrets sequentially exposed to an H3N2 virus from the 1990s and a contemporary seasonal influenza vaccine produced the same type of H1/H3 cross-reactive antibodies. We found evidence that H1N1 viruses are currently evolving within the human population to abrogate the binding of these antibodies. Together, our study demonstrates how prior influenza virus exposures can influence the specificity of antibodies elicited by entirely different influenza virus subtypes, and how viruses evolve to escape these types of antibodies.
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