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Older adults might be more resistant to bird flu infections than children, Penn research finds

By Penn Medicine  
   March 14, 2025

Prior exposures to specific types of seasonal influenza viruses promote cross-reactive immunity against the H5N1 avian influenza virus, according to new research from the Perelman School of Medicine at the University of Pennsylvania. Older adults who were exposed to seasonal flu viruses that circulated prior to 1968 were found to be more likely to have antibodies that bound to the H5N1 avian flu virus.

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