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Flu shot provided relatively robust level of protection this year, data show

This year’s flu shot generated relatively robust levels of protection, new data show, with the vaccine’s effectiveness ranging between about 45% and 55%, depending on the age group and the metric studied, such as whether there was protection against any infection or infection that was severe enough to require hospitalization.

The data were presented Wednesday to the Advisory Committee on Immunization Policy, which advises the Centers for Disease Control and Prevention.

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