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In order to test the effectiveness of a medicine or vaccine, you need to know how much difference just that one factor made in the results. The placebo (a substance that will have no effect on whether a person gets sick or on the course of the illness) is given to the control group, so that any difference in the health of the other group can be attributed specifically to the vaccine or medication.

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Q: Why did one group have a placebo sprayed into their nostril before exposure to the virus?
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