Older adults show greater resistance to H5N1 infections than children

New research from the Perelman School of Medicine at the University of Pennsylvania suggests that prior exposure to specific seasonal influenza strains provides older adults with some immunity against H5N1 avian influenza. Individuals exposed to flu viruses circulating before 1968 were found to have antibodies capable of recognizing H5N1, indicating that younger adults and children, who lack this exposure, would benefit most from vaccination. The study, published in Nature Medicine, highlights the importance of early-life flu exposure in shaping lifelong immune responses. Cross-reactive immunity and potential pandemic protection According to senior author Scott Hensley, PhD, childhood influenza exposures can generate long-lasting immune responses. The research team discovered that antibodies formed in response to past H1N1 and H3N2 infections can also bind to H5N1 avian flu, potentially limiting disease severity in the event of a pandemic. While these antibodies may not prevent infection entirely, they could help reduce the impact of the virus...