Seasonal flu shot may increase H1N1 risk...

Preliminary research suggests the seasonal flu shot may put people at greater risk for getting swine flu, CBC News has learned.

"This is some evidence that has been floated. It hasn't been validated yet, it's very preliminary," cautioned Dr. Don Low, microbiologist-in-chief at Mount Sinai Hospital in Toronto.

"This is obviously important data to help guide policy decisions. How can we best protect people against influenza?"

It's important to validate the information, which has not been peer reviewed, to make sure it's not just a fluke, and that the observation is confirmed elsewhere such as in the Southern Hemisphere, which just completed its seasonal flu season, or in the U.S. and UK. More...

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