The vaccine dilemma: how experts weigh benefits for many against risks for a few
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You’ve likely seen a version of the image above. Some people observe two faces in profile. Others see a vase.
The same phenomenon can occur when scientists look at data, particularly when they try to weigh the benefits and risks of individual vaccines. Vaccines protect huge numbers of people, generally children, from serious diseases, but in rare cases, certain vaccines can tragically cause harm. How do those scientists figure out which to value more?
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