Myth: Flu shots can cause the flu

Flu vaccines contain only inactivated flu viruses. They're unable to cause infection. In fact, studies comparing flu shot recipients to people who get salt-water (placebo) shots show that the only differences in the two groups are that the flu shot recipients experience redness at the injection site and arm soreness. They weren't more likely to experience body aches, fever, cough, runny nose, or sore throat.

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