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Daily Archives: April 12, 2010

New Canadian Studies Suggest Seasonal Fu Shot Increased H1N1 Risk

By |April 12, 2010|Flu|

Source SIDRAP

Despite a rapidly launched range of studies, investigators in Canada are still unable to say—or to rule out—whether receiving a seasonal flu vaccination in the 2008-09 season made it more likely that Canadians would become ill from 2009 pandemic H1N1 flu.

In a lengthy article published today in Public Library of Science Medicine (PLoSMed), researchers detail the results of four supplementary studies that were launched after an April 2009 school outbreak provided the first signal of an association between seasonal flu shots and pandemic flu illness. The studies, which took in about 2,700 people, found overall that the likelihood of needing medical attention for pandemic flu was 1.4 to 2.5 times greater among people who were vaccinated the previous fall. (more…)