Past flu exposure may protect against H5N1 bird flu
New research suggests that past exposure to seasonal flu viruses may help protect people from severe illness caused by the H5N1 avian flu virus. Scientists at the Perelman School of Medicine at the University of Pennsylvania found that older adults who were exposed to flu viruses circulating before 1968 were more likely to have antibodies that recognize H5N1.
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Previous exposures to older flu strains prime the immune system to produce antibodies against bird flu (H5N1).
Older adults who were exposed to seasonal flu viruses that circulated prior to 1968 are more likely to have some protection against H5N1, and children would benefit more from H5N1 vaccines.
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