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Flu is surging in the U.S. A new strain complicates vaccination efforts.

 What to know

Flu cases in the U.S. are rising due to a new H3N2 strain, which may reduce vaccine effectiveness, according to the CDC. Hospitalizations and deaths have increased, but the flu season hasn't peaked. Experts stress vaccines still protect against severe outcomes. The new strain emerged after flu shots were finalized, raising concerns about health system strain.

Summary is AI-generated, newsroom-reviewed.

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