The Guardian

Early flu rise on US west coast prompts calls for annual vaccination

California’s flu test positivity rate is 9.65%, above the 1% normally seen in early October. Cases across the US west coast are increasing ahead of the usual seasonal pattern, which brings rising activity in December and a February peak. With flu activity arriving early, US health experts are emphasizing the importance of annual vaccination.

Source published: Brief prepared:
Early flu rise on US west coast prompts calls for annual vaccination
Image source · The Guardian

What to know

  • 01

    California’s flu test positivity rate is 9.65%, compared with the usual 1% for early October.

  • 02

    The report also notes a mutation in the H1N1 influenza A strain.

Why it matters

The unusually early flu activity provides context for health experts’ emphasis on annual vaccination.

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