Unpublished studies question whether seasonal flu shot raises swine flu risk

Unpublished studies question whether seasonal flu shot raises swine flu risk
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Wed Sep 23, 11:02 PM



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By Helen Branswell, Medical Reporter, The Canadian Press


TORONTO - Unpublished Canadian data are raising concerns about whether it's a good idea to get a seasonal flu shot this fall and fuelling a drive by some public health officials in Canada to delay, reduce or scrap altogether campaigns to vaccinate against seasonal flu this year.


Drawn from a series of studies from British Columbia, Quebec and Ontario, the data appear to suggest that people who got a seasonal flu shot last year are about twice as likely to catch swine flu as people who didn't.