Webreviews of past studies have found that the flu vaccine lowers the risk of flu illness by 40% to 60% when the vaccine matches the spreading flu viruses.

Weba 2021 study showed that among adults hospitalized with flu, vaccinated patients had a 26% lower risk of intensive care unit (icu) admission and a 31% lower.

In adults, the shots were.

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Even when the vaccine.

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