Roughly 1 in 5 unvaccinated people had the flu between 2006 and 2011, but only a quarter of them had symptoms, a study found. That could affect how the virus spreads.
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I've never had the flu. Are there some people who don't get it? - Quora
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Every year, whether I get a flu shot or not, I get the flu. Do our bodies not develop immunities to it over time? - Quora
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