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The remainder of the news report that Rov quotes above goes on to explain that the vaccine is not as effective for as long as previousl thought
// Dr. McKinnon, on late Thursday night, heard that Health Canada, after a thorough consultation with the vaccine manufacturer GlaxoSmithKline, pulled down the expiry date of the nation's adjuvanted H1N1 vaccine.
The revision, however, is not safety-related but mostly due to a fall in the strength of the H1N1 antigen in some particular lots.
Dr. McKinnon shared that the antigen has managed to destabilize much more quickly than previously expected, and therefore, it no longer in a sufficient enough quantity to develop an immune response. //
As the UK bought 100 million doses last year, and only a small fraction were used, I guess we will be throwing away even more than Canada.