Influenza, or flu, is caused by the influenza virus, a highly contagious pathogen that affects the respiratory system. It spreads through respiratory droplets when an infected person coughs, sneezes, or talks, and can also be contracted by touching contaminated surfaces and then touching the face. The influenza virus undergoes frequent mutations, resulting in new strains each season, which is why the flu vaccine is updated annually to provide the most effective protection against current variants.
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