Can adults catch the flu twice in the same season?
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Yes, adults can catch the flu twice in the same season because influenza viruses are constantly mutating into new strains, and being infected by one strain does not provide immunity against others. Additionally, multiple distinct strains—such as different types of Influenza A and B—frequently circulate during a single flu season, meaning a person can recover from one infection and catch a completely different strain a few weeks or months later.