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A British study widely publicized in various online and print media outlets claims that flu vaccines can reduce the risk of heart attacks by as much as 19 percent. Critics, however, say the study is flawed, and that the "data" in it do not mean what the researchers are telling media.
The study looked at the records of 79,000 patients age 40 or older in England and Wales from 2001 to 2007, and after certain "controls" were factored in, researchers determined that those who'd gotten flu shots had fewer heart attacks. They admitted, however, that "there's still a debate about whether this is a true link or not."