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    Flu vaccine provided dismal protection against this winter’s virus, early data suggest

    The first reckoning of how well the flu vaccine is protecting against H3N2 viruses this year in North America has a dismal answer: not very.
    by Helen Branswell Feb 01, 2018 4 minutes
    Source: Carolyn Kaster/AP

    As the country battles an especially fierce flu season, experts have struggled to explain why one family of virus — the influenza A virus H3N2 — that has infected a lot of people in recent years is causing so much damage again this winter.

    Now, new data from north of the border sheds some light on the question.

    Canadian influenza researchers reported Thursday in the online journal Eurosurveillance that the first reckoning of how well the flu vaccine is protecting against H3N2 viruses this year in North America has a dismal answer: not very.

    Their midseason estimate, based on data from the

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