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Why vaccine side effects really happen, and when you should worry


Why vaccine side effects really happen, and when you should worry
Chills, headache, and fatigue after a shot are perfectly normal. But reactions can vary wildly, and they don’t reflect how your immune system would respond to a COVID-19 infection.
ByLinda Marsa
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Side effects can be a powerful deterrent stopping people from getting vaccinated. To address this issue, in 1991, a group of scientists in Minnesota at the Department of Veterans Affairs and the Mayo Clinic devised an experiment to see just how frequent these unpleasant reactions were.
The study involved more than 300 veterans over the age of 65 who were given either a flu shot followed two weeks later by a placebo injection of salt water, or a placebo shot followed two weeks later by the real vaccine. ....

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