Influenza (flu) Causes - Diseases and Conditions - Mayo Clinic - 0 views
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Flu viruses travel through the air in droplets when someone with the infection coughs, sneezes or talks.
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Influenza viruses are constantly changing, with new strains appearing regularly.
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But antibodies against flu viruses you've encountered in the past can't protect you from new influenza subtypes that are very different immunologically from what you had before.
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