“This study did not measure risk of heart attack in vaccinated and non-vaccinated people. It measured rates of vaccination among heart attack patients and those without heart attack,” said Garratt, noting it was a useful way to look for a connection between heart attacks and flu shots, but not to draw the conclusion drawn by the author.
Siriwardena stressed, however, that, “I think it is important again to say again that we found an association rather than proving cause-and-effect. We also found a greater association between reduction of heart attack and early vaccination.”
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