The current flu vaccines appear to be a bad match for the dominant strain so far this influenza season, new research suggests, leading experts to warn that the United States could be in for a bad flu season, on top of what’s already shaping up to be another devastating surge of Covid cases.

Before each flu season, scientists must predict which strains will be the most common, and design a flu shot to match these predictions. This year’s flu shot includes four strains.

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