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Review Question - QID 213807

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QID 213807 (Type "213807" in App Search)
A 35-year-old man with no past medical history finds an ad online recruiting for a clinical trial. The clinical trial is evaluating a universal influenza vaccine that may provide long-term protection against influenza. The goal of the study is to assess the safety and toxicity of the vaccine. The man fulfills participation criteria and successfully enrolls in the study. Which of the following is a characteristic of this type of trial?