A(H1N1)pdm09 viruses trace back to 1918 Spanish Flu, adapted from swine flu; A(H3N2) and H5N1 are recent co-circulating human avian strains. Influenza A causes pandemics, evolving from birds to mammals.
It's unclear which flu types pose risks akin to the Spanish Flu of 1918 or a COVID-style pandemic. Understanding influenza classifications from bird, cow, to swine flues helps navigate public health challenges and vaccine strategies.
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