People who got the flu shot had no protection against the dominant strain of influenza circulating this winter, public health officials now say. The H3N2 virus was once again prevalent this year and the vaccine has performed poorly against it in recent years because of a mismatch, with about 40 per cent effectiveness in 2010-11 and 2012-13 compared to upwards of 70 per cent when there’s a good match.

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